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ENERGY (185 journals)                  1 2 | Last

Advances in Building Energy Research     Hybrid Journal   (Followers: 12)
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Advances in High Energy Physics     Open Access   (Followers: 13)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 15)
American Journal of Energy Research     Open Access   (Followers: 7)
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Annual Review of Resource Economics     Full-text available via subscription   (Followers: 11)
Applied Nanoscience     Open Access   (Followers: 10)
Applied Solar Energy     Hybrid Journal   (Followers: 12)
Archives of Thermodynamics     Open Access   (Followers: 4)
Artificial Photosynthesis     Open Access  
Atomic Energy     Hybrid Journal   (Followers: 5)
Atoms for Peace: an International Journal     Hybrid Journal   (Followers: 4)
Batteries     Open Access   (Followers: 1)
Biofuel Research Journal     Open Access   (Followers: 1)
Biofuels     Hybrid Journal   (Followers: 9)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 6)
Bulletin de droit nucleaire     Full-text available via subscription   (Followers: 1)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 13)
Canadian Water Resources Journal     Hybrid Journal   (Followers: 20)
Carbon Management     Hybrid Journal   (Followers: 6)
Catalysis for Sustainable Energy     Open Access   (Followers: 3)
CERN courier. International journal of high energy physics     Free   (Followers: 1)
Chain Reaction     Full-text available via subscription  
Clefs CEA     Full-text available via subscription   (Followers: 1)
Computational Water, Energy, and Environmental Engineering     Open Access   (Followers: 2)
Current Sustainable/Renewable Energy Reports     Hybrid Journal   (Followers: 4)
Dams and Reservoirs     Hybrid Journal   (Followers: 4)
Development of Energy Science     Open Access   (Followers: 3)
Distributed Generation & Alternative Energy Journal     Hybrid Journal   (Followers: 1)
E3S Web of Conferences     Open Access  
Economics and Policy of Energy and the Environment     Full-text available via subscription   (Followers: 3)
Electrical and Power Engineering Frontier     Open Access   (Followers: 10)
Energy     Partially Free   (Followers: 25)
Energy & Fuels     Full-text available via subscription   (Followers: 25)
Energy and Buildings     Hybrid Journal   (Followers: 7)
Energy and Emission Control Technologies     Open Access  
Energy and Environment Focus     Free  
Energy and Environment Research     Open Access   (Followers: 10)
Energy and Environmental Engineering     Open Access   (Followers: 1)
Energy and Power     Open Access   (Followers: 3)
Energy and Power Engineering     Open Access   (Followers: 10)
Energy Conversion and Management     Hybrid Journal   (Followers: 9)
Energy Efficiency     Hybrid Journal   (Followers: 12)
Energy Harvesting and Systems : Materials, Mechanisms, Circuits and Storage     Hybrid Journal   (Followers: 1)
Energy Journal The     Full-text available via subscription  
Energy Law Journal     Full-text available via subscription   (Followers: 2)
Energy Materials : Materials Science and Engineering for Energy Systems     Hybrid Journal   (Followers: 19)
Energy Policy     Partially Free   (Followers: 48)
Energy Prices and Taxes     Full-text available via subscription   (Followers: 5)
Energy Procedia     Open Access   (Followers: 4)
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Energy Science and Technology     Open Access   (Followers: 12)
Energy Strategy Reviews     Partially Free   (Followers: 6)
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Energy Technology & Policy     Open Access  
Energy, Sustainability and Society     Open Access   (Followers: 19)
Environmental Progress & Sustainable Energy     Hybrid Journal   (Followers: 6)
EPJ Photovoltaics     Open Access   (Followers: 1)
Facta Universitatis, Series : Electronics and Energetics     Open Access  
Frontiers in Energy     Hybrid Journal   (Followers: 4)
Frontiers in Energy Research     Open Access   (Followers: 1)
Fuel and Energy Abstracts     Full-text available via subscription   (Followers: 5)
Functional Materials Letters     Hybrid Journal   (Followers: 1)
Gcb Bioenergy     Hybrid Journal   (Followers: 3)
Geothermal Energy     Open Access   (Followers: 1)
GeoWorld     Full-text available via subscription   (Followers: 2)
Green     Hybrid Journal   (Followers: 2)
IEA Electricity Information     Full-text available via subscription   (Followers: 6)
IEA Natural Gas Information     Full-text available via subscription   (Followers: 4)
IEEE Power and Energy     Full-text available via subscription   (Followers: 12)
IEEE Transactions on Energy Conversion     Hybrid Journal   (Followers: 7)
IEEE Transactions on Nuclear Science     Hybrid Journal   (Followers: 7)
IEEE Transactions on Power Systems     Hybrid Journal   (Followers: 11)
IET Power Electronics     Hybrid Journal   (Followers: 13)
IngenierĂ­a EnergĂ©tica     Open Access  
Innovations : Technology, Governance, Globalization     Hybrid Journal   (Followers: 6)
International Journal of Alternative Propulsion     Hybrid Journal   (Followers: 1)
International Journal of Ambient Energy     Hybrid Journal   (Followers: 2)
International Journal of Applied Power Engineering     Open Access   (Followers: 2)
International Journal of Clean Coal and Energy     Open Access   (Followers: 4)
International Journal of Coal Science & Technology     Open Access  
International Journal of Critical Infrastructure Protection     Hybrid Journal   (Followers: 6)
International Journal of Electric and Hybrid Vehicles     Hybrid Journal   (Followers: 6)
International Journal of Emerging Electric Power Systems     Hybrid Journal   (Followers: 5)
International Journal of Emerging Multidisciplinary Fluid Sciences     Full-text available via subscription  
International Journal of Energy and Environmental Engineering     Open Access   (Followers: 2)
International Journal of Energy and Power     Open Access   (Followers: 7)
International Journal of Energy and Statistics     Hybrid Journal  
International Journal of Energy Engineering     Open Access   (Followers: 12)
International Journal of Energy Research     Hybrid Journal   (Followers: 10)
International Journal of Energy Science     Open Access   (Followers: 1)
International Journal of Flow Control     Full-text available via subscription   (Followers: 4)
International Journal of Global Energy Issues     Hybrid Journal   (Followers: 6)
International Journal of Green Energy     Hybrid Journal   (Followers: 6)

        1 2 | Last

Journal Cover   Functional Materials Letters
  [SJR: 0.528]   [H-I: 14]   [1 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1793-6047 - ISSN (Online) 1793-7213
   Published by World Scientific Homepage  [120 journals]
    • Authors: Kaiyang Zeng
      Abstract: Functional Materials Letters, Ahead of Print.

      Citation: Functional Materials Letters
      PubDate: Fri, 29 May 2015 08:18:29 GMT
      DOI: 10.1142/S1793604715020014
  • Cyclic degradation of titanium–tantalum high-temperature shape
           memory alloys — the role of dislocation activity and chemical
    • Authors: T. Niendorf, P. Krooß, C. Somsen, R. Rynko, A. Paulsen, E. Batyrshina, J. Frenzel, G. Eggeler, H. J. Maier
      Abstract: Functional Materials Letters, Ahead of Print.
      Titanium–tantalum shape memory alloys (SMAs) are promising candidates for actuator applications at elevated temperatures. They may even succeed in substituting ternary nickel–titanium high temperature SMAs, which are either extremely expensive or difficult to form. However, titanium–tantalum alloys show rapid functional and structural degradation under cyclic thermo-mechanical loading. The current work reveals that degradation is not only governed by the evolution of the ω-phase. Dislocation processes and chemical decomposition of the matrix at grain boundaries also play a major role.
      Citation: Functional Materials Letters
      PubDate: Tue, 21 Apr 2015 09:05:36 GMT
      DOI: 10.1142/S1793604715500629
  • A novel yellowish white Dy3+ activated α-Al2O3 phosphor:
           Photoluminescence and optical studies
    • Authors: Sandeep Kumar, Ram Prakash, Vinay Kumar
      Abstract: Functional Materials Letters, Ahead of Print.
      Trivalent Dy doped α-Al2O3 phosphor was synthesized by low temperature solution combustion method using urea as fuel. The phosphor was well characterized by X-ray diffraction (XRD), photoluminescence (PL) spectroscopy and diffused reflectance spectroscopy (DRS). XRD study confirmed the hexagonal structure of Dy3+ doped α-Al2O3 as prepared phosphor. Under various ultraviolet (UV) excitations (353 nm, 367 nm and 325 nm), α-Al2O3:Dy3+ phosphor exhibits the characteristic emission bands centered at 490 nm, 589 nm and 670 nm, resulting from the 4F9/2–6HJ/2 (J = 15, 13, 11) transitions of Dy3+, respectively. The observed CIE coordinates (x,y) as (0.373, 0.379) corresponds to the shade of yellowish white in color gamut. The bandgap was calculated using diffused reflectance (DR) spectrum and it was estimated around 5.9 eV.
      Citation: Functional Materials Letters
      PubDate: Mon, 20 Apr 2015 06:59:17 GMT
      DOI: 10.1142/S1793604715500617
  • Multi-cations doped LiVPO4F cathode for lithium-ion batteries
    • Authors: Rui Zhang, Xiaofei Sun, Youlong Xu, Feng Teng, Gongyu Sun, Yanjun Chen, Guogang Chen
      Abstract: Functional Materials Letters, Ahead of Print.
      The multi-cations doped LiVPO4F, nominally Li0.97Cr0.01V0.95Al0.01Nb0.02PO4F0.97, is prepared by Chromium (Cr) doping on lithium site and Al–Nb co-doping on vanadium site via a conventional carbothermal reduction (CTR) route. The crystallographic lattice volume, particle size and morphology are not obviously changed comparing with un-doped LiVPO4F. However, the high rate and lifetime cycling performances are noticeably improved although the capacities at very low currents are slightly decreased. The reversible capacity at 1/10 C, 1 C, 2 C and 4 C of the pristine LiVPO4F is 143 mA h g-1, 99 mA h g-1, 86 mA h g-1 and 70 mA h g-1, respectively, while that of the doped counterpart is 138 mA h g-1, 102 mA h g-1, 95 mA h g-1 and 82 mA h g-1, respectively. The capacity retention after 100 galvanostatic cycles at 1.5 C is enhanced from 85.4% to 90.9% by such multi-cations doping. Moreover, the initial coulombic efficiency is significantly increased from 81.8% to 90.3% as well.
      Citation: Functional Materials Letters
      PubDate: Fri, 17 Apr 2015 02:48:46 GMT
      DOI: 10.1142/S1793604715500605
  • Hydrothermal synthesis of Fe2O3/ZnO heterojunction photoanode for
           photoelectrochemical water splitting
    • Authors: Chao Chen, Hongye Bai, Zulin Da, Meng Li, Xu Yan, Jinhui Jiang, Weiqiang Fan, Weidong Shi
      Abstract: Functional Materials Letters, Ahead of Print.
      We report a photoanode based on Fe2O3/zinc oxide (ZnO) heterojunction synthesized by hydrothermal method for photoelectron-chemical (PEC) water splitting. The forming heterojunction is systemically characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results from the I–V characteristic curve and conversation efficiency of Fe2O3/ZnO heterojunction reveal that the forming heterojunction would be a benefit for electron transferring from conduction band of ZnO to that of Fe2O3. However, the quantity of ZnO film has an effect on the photocurrent density, the suitable of which has shown enhanced PEC performance.
      Citation: Functional Materials Letters
      PubDate: Fri, 17 Apr 2015 02:48:46 GMT
      DOI: 10.1142/S1793604715500587
  • High vibration damping in in situIn–Zn composites
    • Authors: Samuel P. Balch, Roderic S. Lakes
      Abstract: Functional Materials Letters, Ahead of Print.
      Indium–zinc in situ composites were fabricated and their viscoelastic properties studied over 8.5 decades of frequency. Material with 5% indium by weight was found to have a stiffness damping product (the figure of merit for damping layers) of 1.9 GPa at 10 Hz; 3 times better than the peak of polymer damping layers and over a wider frequency range. Material with 15% indium had a stiffness damping product of 1.8 GPa. The indium segregated in a platelet morphology, particularly favorable for attaining high damping from a small concentration, as predicted by viscoelastic composite theory.
      Citation: Functional Materials Letters
      PubDate: Fri, 17 Apr 2015 02:48:46 GMT
      DOI: 10.1142/S1793604715500599
  • Cellulose acetate–lithium bis(trifluoromethanesulfonyl)imide solid
           polymer electrolyte: ATR-FTIR and ionic conductivity behavior
    • Authors: Siti Masyitah Mohd Razalli, Siti Irma Yuana Sheikh Mohd Saaid, Ab Malik Marwan Ali, Oskar Hasdinor Hassan, Muhd Zu Azhan Yahya
      Abstract: Functional Materials Letters, Ahead of Print.
      Solid polymer electrolytes (SPEs) based on cellulose acetate (CA) doped with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt are prepared by solution cast technique. Attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy of the polymer salt complexes are recorded in the frequency range between 400 cm-1 and 4000 cm-1. The shifting of carbonyl band (C=O) at 1737 cm-1 to a lower wavenumber confirms the occurrence of complexation between the polymer and the salt. The electrochemical impedance spectroscopy (EIS) analysis discovered that the film with 25 wt.% of salt shows the highest ionic conductivity at room temperature. The change in real dielectric permittivity (εr) as a function of frequency at different salt concentrations which exhibits a dispersive behavior at low frequencies and decays at higher frequencies, shows the electrode polarization and space charge effect. The real modulus formalism (Mr) analysis shows that the polymer electrolytes in this work are ionic conductors.
      Citation: Functional Materials Letters
      PubDate: Tue, 31 Mar 2015 06:47:34 GMT
      DOI: 10.1142/S1793604715400172
  • Abnormal capacitance–voltage and switchable photovoltaic effect of
           epitaxial Mn-doped BiFeO3 thin film capacitor
    • Authors: Zeng-Wei Peng, Bao-Ting Liu
      Abstract: Functional Materials Letters, Ahead of Print.
      Epitaxial BiFe0.95Mn0.05O3 (BFMO) film was deposited on (001)-oriented SrRuO3 (SRO) coated SrTiO3 (STO) substrate by radio-frequency (rf) magnetron sputtering. Indium tin oxide (ITO) was grown on BFMO/STO heterojunction to fabricate ITO/BFMO/SRO capacitor for investigating the ferroelectric and photovoltaic properties. The ITO/BFMO/SRO capacitor exhibits large remanent polarizations of 92.2 μC/cm2, 101 μC/cm2 and 109 μC/cm2 measured at 20 V, 25 V and 30 V, respectively. An observed abnormal capacitance–voltage (C–V) curve can be explained based on the ITO/BFMO interface. The calculated capacitance and junction width of ITO/BFMO interface are 105 pF and 32 nm, respectively. Additionally, it is found that photovoltaic effect of the ITO/BFMO/SRO capacitor is mainly attributed to ferroelectric polarization and internal electric field induced by defects. The photocurrent densities coming from ferroelectric polarization and internal field are 36 μA/cm2 and 23 μA/cm2, respectively. The photovoltaic output from the ferroelectric polarization is obviously larger than that from the internal electric field.
      Citation: Functional Materials Letters
      PubDate: Tue, 31 Mar 2015 06:47:34 GMT
      DOI: 10.1142/S1793604715500575
  • Synthesis and magnetic property of SiO2 coated Fe3O4/palygorskite
    • Authors: Xi He, Qian Yang, Liangjie Fu, Huaming Yang
      Abstract: Functional Materials Letters, Ahead of Print.
      SiO2 coated Fe3O4/palygorskite magnetic nanocomposites (MNCs) were successfully synthesized via coprecipitation route. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), transmission electron microscopy (TEM) and magnetic properties. The resulsts indicated that SiO2 was coated on the surface of Fe3O4/palygorskite through the hydrolysis of tetraethyl orthosilicate (TEOS) and the orientation changing of MNCs could be realized by external magnetic field. The interfaces of the composite were further elucidated at atomic level. We believe that the as-prepared SiO2 coated Fe3O4/palygorskite MNCs could show potential application in the fields of functional nanomaterials.
      Citation: Functional Materials Letters
      PubDate: Tue, 31 Mar 2015 06:47:33 GMT
      DOI: 10.1142/S1793604715500563
  • Interplay between magnetism and Na concentration in NaxCoO2
    • Authors: M. H. N. Assadi, H. Katayama-Yoshida
      Abstract: Functional Materials Letters, Ahead of Print.
      Through comprehensive density functional calculations, the crystallographic, magnetic and electronic properties of NaxCoO2 (x = 1, 0.875, 0.75, 0.625 and 0.50) were investigated. We found that all Na ions in NaCoO2 and Na0.875CoO2 share the basal coordinates with O ions. However, as x decreases, some of Na ions move within the basal plane in order to reduce the in-plane Na-Na electrostatic repulsion. Magnetically, there was strong tendency for type A antiferromagnetism in the Na0.75CoO2 system, while all other Na deficient systems had a weaker ferromagnetic (FM) tendency. The results on magnetism were in excellent agreement with the experiments.
      Citation: Functional Materials Letters
      PubDate: Tue, 31 Mar 2015 06:47:33 GMT
      DOI: 10.1142/S1793604715400160
  • Investigation of electrical transport properties of Bi0.5Sb1.5Te2.7Se0.3
           alloys prepared by high-pressure method
    • Authors: Xin Guo, Xiaopeng Jia, Yuewen Zhang, Hairui Sun, Bing Sun, Hongan Ma
      Abstract: Functional Materials Letters, Ahead of Print.
      The quaternary Bi0.5Sb1.5Te2.7Se0.3 alloys have been successfully synthesized within 25 min by high-pressure method. The pressure-dependent electrical transport properties of the as-prepared Bi0.5Sb1.5Te2.7Se0.3 alloys are carefully investigated at room temperature. The measurement results indicate that the electrical resistivity and the Seebeck coefficient reveal a strong correlation with the increase of synthesis pressure. The carrier concentration and mobility are modulated effectively due to the effects of synthesis pressure and composition, leading to an improvement in the power factor of Bi0.5Sb1.5Te2.7Se0.3. These results suggest that the utilization of pressure during the synthesis process provides an effective and controllable strategy to optimize the electrical transport properties of the (Bi,Sb)2(Te,Se)3 alloys.
      Citation: Functional Materials Letters
      PubDate: Thu, 19 Mar 2015 03:06:29 GMT
      DOI: 10.1142/S1793604715500551
  • Ultra large deflection of thin PZT/aluminium cantilever beam
    • Authors: Raynald Seveno, Benoit Guiffard, Jean-Pierre Regoin
      Abstract: Functional Materials Letters, Ahead of Print.
      Flexible piezoelectric cantilever beam has been realized by depositing lead zirconate titanate (PZT) thin film (4.5 μm) by chemical solution deposition (CSD) onto very thin aluminium foil (16 μm). The tip deflection of the beam has been measured as a function of the frequency of the applied sinusoidal voltage to the PZT film for different amplitudes. Resonance curves have been compared to a classical model of an oscillating system under sinusoidal stress with a very good agreement. Despite of weak ferroelectric properties (remnant polarization: 13 μC/cm2), ultra-large deflection amplitudes have been measured under very moderate applied voltage values: 750 μm@10 V for quasi-static mode and 5 mm@10 V at the resonance frequency (∼12 Hz), which makes this PZT/aluminium composite film very promising for highly flexible actuation applications where large displacements are wanted.
      Citation: Functional Materials Letters
      PubDate: Wed, 11 Mar 2015 02:01:31 GMT
      DOI: 10.1142/S1793604715500514
  • Direct observation of magnetic exchange-spring development in epitaxial
           DyFe2/YFe2 superlattices by magneto-optical Kerr effect
    • Authors: Ke Wang, Yang Xiang, Chuanwen Chen, Fengjiang Zhuang, Xuefeng Wu, Roger Ward
      Abstract: Functional Materials Letters, Ahead of Print.
      The magnetic reversal properties of molecular beam epitaxy (MBE) grown Laves phase single crystal YFe2-dominated DyFe2/YFe2 superlattices were investigated using magneto-optical Kerr effect (MOKE) measurements. Single crystal DyFe2/YFe2 superlattices with a thickness ratio of 1:4 were MBE-grown with a (110) growth direction. In the epitaxial superlattices, the development of exchange-spring structure during magnetic reversal is revealed by both magneto-optical reflectivity and Kerr rotation angle loops. The bending fields of the samples are found to be close due to nonideal anisotropy in both hard and soft layers. For the sample with thin soft/hard layers, large magneto-optical reflectivity change up to 0.25% was observed. This can be related with rotation of Fe spins in YFe2 soft layers under a low pinning field, in consistence with the small switching field of thin DyFe2 hard layers measured experimentally.
      Citation: Functional Materials Letters
      PubDate: Wed, 11 Mar 2015 02:01:31 GMT
      DOI: 10.1142/S1793604715500538
  • Silicon quantum dots embedded in amorphous SiC matrix for third-generation
           solar cells: Microstructure control by RF discharge power
    • Authors: Qijin Cheng, Igor Levchenko, Denyuan Song, Shuyan Xu, Kostya (Ken) Ostrikov
      Abstract: Functional Materials Letters, Ahead of Print.
      A low-frequency (460 kHz), low-pressure, thermally non-equilibrium, high-density inductively coupled plasma (ICP) has been used to synthesize a novel, advanced photovoltaic material suitable for fabrication of third-generation solar cells. Silicon quantum dots (SQDs) embedded in an amorphous silicon carbide matrix were prepared at a very low substrate temperature of approximately 200°C without any hydrogen dilution. The effect of the radio-frequency (RF) power of the plasma discharge on the morphology and structure of the embedded quantum dots was studied. A brief discussion on the possible mechanisms of the quantum dot formation in the ICP is presented. This study is relevant to third-generation photovoltaic solar cells.
      Citation: Functional Materials Letters
      PubDate: Wed, 11 Mar 2015 02:01:30 GMT
      DOI: 10.1142/S179360471550054X
  • Fabrication and characterization of environmental-friendly Ni1-xRxTiO3
           nanopigments with high NIR reflectance
    • Authors: Yu-Ping Tong, Zheng Chen, Hui-Xian Wang, Xu-Fang Zhang, Jun-Tao Ma, Xi Chen
      Abstract: Functional Materials Letters, Ahead of Print.
      A series of novel high dispersed environmental-friendly nanopigments based on NiTiO3 doped with rare earth ion such as Y, La, Eu, Sm have been developed. The products were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), commission internationale de l'Eclairage (CIE) 1976 L* a* b* color scales and UV-Vis-near-infrared radiation (NIR) reflectance spectroscopy. The substitution of R3+ for Ni2+ in NiTiO3 can improve the yellowness of pigments, especially for Eu3+ substitution. The sample with the substitution of Eu3+ for Ni2+ processes the highest NIR reflectance and enhances the NIR reflectance to 89.0%. SEM results revealed that the obtained pigments were composed of well-dispersed spherical-like particles with the range of 40–60 nm. EDS results indicated that the distribution of Ni, Ti, R, O element was considerably uniform with no chemical segregation phenomenon.
      Citation: Functional Materials Letters
      PubDate: Wed, 11 Mar 2015 02:01:30 GMT
      DOI: 10.1142/S1793604715500502
  • Photovoltaic properties of silicon nanocrystals in silicon nitride
           prepared by ammonia sputtering
    • Authors: Xiaobo Chen
      Abstract: Functional Materials Letters, Ahead of Print.
      In this work, we present an investigation of the photovoltaic properties of low-temperature (700°C annealing temperature) prepared P-doped Silicon nanocrystals (SiNCs) in silicon nitride by ammonia sputtering followed by rapid thermal annealing (RTA). We examined how the flow rate of NH3 influenced the structural properties of the annealed films by using Raman scattering, grazing incidence X-ray diffraction (GI XRD) and transmission electron microscopy (TEM), it was found that the appropriate flow rate of NH3 is 3 sccm. For the sample deposited at the flow rate of 3 sccm, TEM image showed that SiNCs were formed with a mean size about 3.7 nm and the density of ~ 2.1 × 1012 cm-2; X-ray photoelectron spectroscopy (XPS) characterization showed the existence of Si–P bonds, indicating effective P doping; the average absorptance of higher than 65% and a significant amount of photocurrent makes it suitable for photoactive. Moreover, the experimental P-doped SiNCs:Si3N4/p-Si heterojunction solar cell has been fabricated, and the device performance was studied. The photovoltaic device fabricated exhibits an open-circuit voltage (VOC) and a short-circuit current density (JSC) of 470 mV and 3.25 mA/cm2, respectively.
      Citation: Functional Materials Letters
      PubDate: Wed, 11 Mar 2015 02:01:29 GMT
      DOI: 10.1142/S1793604715500526
  • Effect of the matrix subsystem on hydrostatic parameters of a novel
           1–3-type piezo-composite
    • Authors: Vitaly Yu. Topolov, Christopher R. Bowen, Paolo Bisegna, Anatoly E. Panich
      Abstract: Functional Materials Letters, Ahead of Print.
      The influence of the aspect ratio and volume fraction of ferroelectric ceramic inclusions in a 0–3 matrix on the hydrostatic parameters of a three-component 1–3-type composite is studied to demonstrate the important role of the elastic properties of the two-component matrix on the composite performance. Differences in the elastic properties of the 0–3 matrix and single-crystal rods lead to a considerable dependence of the hydrostatic response of the composite on the anisotropy of the matrix elastic properties. The performance of a 1–0–3 0.92Pb(Zn1/3Nb2/3)O3–0.08PbTiO3 SC/modified PbTiO3 ceramic/polyurethane composite suggests that this composite system is of interest for hydroacoustic applications due to its high hydrostatic piezoelectric coefficients $d_{h}^{*} \approx (400-500)\,{\rm pC/N}$ and $g_{h}^{*} \sim 0.1\,{\rm V}\cdot {\rm m/N}$, squared figure of merit d_{h}^{*}g_{h}^{*} \approx (30-40)\cdot 10^{-12}\,{\rm Pa}^{-1}$, and electromechanical coupling factor $k_{h}^{*} \approx 0.5-0.6$.
      Citation: Functional Materials Letters
      PubDate: Thu, 26 Feb 2015 02:50:22 GMT
      DOI: 10.1142/S1793604715500496
  • Interface characterization of Cu–Mo coating deposited on Ti–Al
           alloys by arc spraying
    • Authors: Shengqiang Bai, Fei Li, Ting Wu, Xianglin Yin, Xun Shi, Lidong Chen
      Abstract: Functional Materials Letters, Ahead of Print.
      Cu–Mo pseudobinary alloys are promising candidates as electrode materials in CoSb3-based skutterudite thermoelectric (TE) devices for TE power generation. In this study, Cu–Mo coatings were deposited onto Ti–Al substrates by applying a dual-wire electric arc spraying coating technique. The microstructure of the surfaces, cross sections and coating interfaces were analyzed by scanning electron microscopy (SEM) and energy dispersion spectrometry (EDS). Cu–Mo coatings showed a typical banded splat with compact microstructures, and have no coarse pores nor micro-cracks. The thermal shock resistance of the Cu–Mo coating was also investigated to show good combinations with Ti–Al substrates. After 50 thermal shock cycles, there were no cracks observed at the interface. In contrast, the test of the thermal shock resistance of the Cu coating on the Ti–Al substrate was also investigated. Due to a large difference in the thermal expansion coefficients between Cu and Ti–Al alloys, the Cu coating flaked from the Ti–Al substrate completely after 10 thermal shock cycles. The contact resistivity of the Ti–Al/Cu–Mo interface was about 1.6 μΩ⋅cm2 and this value was unchanged after 50 thermal shock cycles, indicating the low electric resistance and high thermal stability of the Cu–Mo/Ti–Al interface.
      Citation: Functional Materials Letters
      PubDate: Thu, 26 Feb 2015 02:50:22 GMT
      DOI: 10.1142/S1793604715500484
  • Room temperature reduction and hydrolysis of FeCl3⋅6H2O on
           self-sacrifice microscale Cu2O octahedron template: A mild chemical
           synthesis of pseudocapacitor electrode materials
    • Authors: Mu Zhang, Xiaoyang Peng, Xu Chen, Kunfeng Chen, Xudong Sun, Dongfeng Xue
      Abstract: Functional Materials Letters, Ahead of Print.
      Fe(OH)x(x = 2, 3) colloidal aggregations were synthesized at room temperature via a reduction and hydrolysis of FeCl3⋅6H2O on microscale Cu2O octahedron, which functions as a self-sacrifice template. We herein proposed the growth of Fe(OH)x colloidal aggregation by redox etching Cu2O octahedron while two critical reactions of both redox and precipitation were well employed in this work. As-synthesized Fe(OH)x samples exhibited high specific capacitance of 242.7 F/g, which was higher than those available data of iron oxides and hydroxides.
      Citation: Functional Materials Letters
      PubDate: Wed, 18 Feb 2015 02:17:04 GMT
      DOI: 10.1142/S1793604715500472
  • Synthesis and luminescence properties of novel deep red emitting phosphors
    • Authors: Renping Cao, Dong Ceng, Xiaoguang Yu, Siling Guo, Yufeng Wen, Guotai Zheng
      Abstract: Functional Materials Letters, Ahead of Print.
      Novel deep red phosphor Li2MgGeO4:Mn4+ is synthesized by high temperature solid state reaction method in air. The strongest PL band peaking at ∼ 671 nm in the range of 600–750 nm is due to the 2E → 4A2 transition of Mn4+ ion and the PLE spectra shows broad band peaking at ∼ 323 within the range 220–550 nm owing to the 4A2 → 4T1 transitions of Mn4+ ion. The optimum Mn4+ doping concentration is about 0.4 mol.%. The luminous mechanism is explained by Tanabe–Sugano diagram of Mn4+ ion. The results indicate that red phosphor Li2MgGeO4:Mn4+ is a beneficial phosphor for use in white light-emitting-diodes (LEDs).
      Citation: Functional Materials Letters
      PubDate: Wed, 11 Feb 2015 07:10:41 GMT
      DOI: 10.1142/S1793604715500460
  • The study of composition and surface electron structure of nitrogen-doped
           DLC film prepared by PIII-D
    • Authors: Hai Huang Li, Feng Wen, Changjiang Pan, Hongyan Ding, Nan Huang, Yongxiang Leng
      Abstract: Functional Materials Letters, Ahead of Print.
      Nitrogen-doped diamond-like carbon (N-DLC) films were synthesized by plasma immersion ion implantation and deposition (PIII-D) at room temperature (RT). During the process of deposition, N2 flow was changed from 0 to 10 sccm. Lifshitz–van der Waals/acid–base (LW-AB) approach was employed to study the surface electronic state of the films, X-ray photoelectron spectroscopic (XPS) and valence band spectra (VBS) were used to study chemical bonds and electron structure information inside the films. Bandgap of the films were calculated by the data from ultraviolet spectrophotometer. The results showed that synthesized films were n-type semiconductors and doping of nitrogen element will affect the accepted–electron capability of the film. The change tendency of the bandgap coincides with that of the ratio of acidic to alkaline component of the polar acid-alkali surface energy. There was much sp hybrid electronic state existed in the films, which mainly sp2C=C/C=N and sp3C–C/C–N bonds.
      Citation: Functional Materials Letters
      PubDate: Fri, 06 Feb 2015 01:36:37 GMT
      DOI: 10.1142/S1793604715400159
  • Design of poly(ether block amide)/polyacrylonitrile composite membrane for
           carbon dioxide capture
    • Authors: Lianjun Wang, Pengfei Ji, Yang Li, Mingming Di, Quan Lv, Shuguang Li
      Abstract: Functional Materials Letters, Ahead of Print.
      In this study, poly(ether block amide) was used as coating material to develop a novel composite polymer membrane for CO2 capture. Polyacrylonitrile (PAN) ultrafiltration membrane was applied as substrate. Between them, a gutter layer prepared from cross-linked polydimethylsiloxane (PDMS) blending with amino silicone was introduced to improve separation performance of the composite membrane. The separation properties of resultant triple layer composite membrane was characterized using pure CO2 and N2 gases. It was found that the crosslinking degree of the gutter layer had great influence on membrane performance, which could be significantly improved with the help of amino-PDMS gutter layer compared with that of the membrane having Pebax coating directly onto PAN substrate. Using 2 wt.% Pebax coating solution and properly cross-linked gutter layer, the designed Pebax/amino-PDMS/PAN composite membrane showed CO2 permeance of 147 GPU and CO2/N2 selectivity of 62.
      Citation: Functional Materials Letters
      PubDate: Fri, 06 Feb 2015 01:36:37 GMT
      DOI: 10.1142/S1793604715500459
  • Solid high-proton conductor tungstovanadozincic acid with transition metal
           as central atom: Synthesis and conductivity
    • Authors: Tianpei Huang, Xuefei Wu, Qingyin Wu, Fahe Cao, Wenfu Yan
      Abstract: Functional Materials Letters, Ahead of Print.
      A Keggin-type vanadium-substituted tungstovanadozincic heteropoly acid H7ZnW11VO40 ⋅ 8H2O, with the transition metal as central atom, was firstly synthesized and characterized. Its proton conductivity was measured by the electrochemical impedance spectrum (EIS), and the result indicates that the H7ZnW11VO40 ⋅ 8H2O is a solid high-proton conductor with conductivity of 3.26 × 10-3S ⋅ cm-1 at 58°C, 50% relative humidity. Its activation energy is 29.50 kJ ⋅ mol-1, which suggests that the mechanism of proton conduction is the Vehicle mechanism.
      Citation: Functional Materials Letters
      PubDate: Fri, 06 Feb 2015 01:36:36 GMT
      DOI: 10.1142/S1793604715500411
  • Facile preparation of size-controlled TiO2 nanoparticles by hot-filament
           metal oxide deposition method and their gas sensing properties to NO2
    • Authors: Xiaoguang San, Weiwei Xu, Guosheng Wang, Bing Liang, Nannan Hou, Fanli Meng
      Abstract: Functional Materials Letters, Ahead of Print.
      Titanium dioxide (TiO2) nanoparticles were prepared by resistive heating Ti filament under an oxygen atmosphere. The obtained nanoparticles were confirmed to be a tetragonal crystal TiO2 and the particle size increased with increasing the oxygen pressure. The NO2 gas sensing properties of the TiO2 nanoparticles were investigated. All the sensors made of TiO2 nanoparticles with different particle sizes exhibited the maximum sensitivities to 1 ppm NO2 at a relative low operating temperature of 150°C. Comparing with the large particle size of TiO2 nanoparticles, the ones with the smallest particle size exhibited the highest sensitivity and the best response and recovery characteristic to various NO2 gas concentrations.
      Citation: Functional Materials Letters
      PubDate: Fri, 06 Feb 2015 01:36:36 GMT
      DOI: 10.1142/S1793604715500435
  • Adsorption and photocatalytic degradation of dyes on
           polyacrylamide/calcium alginate/TiO2 composite film
    • Authors: Shuxin Wei, Kongyin Zhao, Xinxin Zhang, Yifan Fu, Zhihui Li, Sai Xu, Junfu Wei
      Abstract: Functional Materials Letters, Ahead of Print.
      A casting solution was prepared by dispersing titanium dioxide (TiO2) nanoparticles in the sodium alginate and acrylamide aqueous solution. The casting solution was spread on a glass plate by a glass rod enlaced with brass wires to control the thickness of the sticky solution. Then polyacrylamide/calcium alginate/TiO2 (PAM/CA/T) composite film was obtained after UV irradiation and cross-linking by CaCl2. The PAM/CA/T film was characterized by scanning electron microscope and transmission electron microscope. The PAM/CA/T film had good strength and toughness. And they did not rupture after swelling in 5 wt.% NaCl solution and still had good mechanical properties. The adsorption properties of the PAM/CA/T film were investigated by using different dyes as the adsorbates. The photocatalytic degradation properties of these dyes on the PAM/CA/T films were also researched. The results indicated that there was no difference in the adsorption efficiency of PAM/CA film and PAM/CA/T-30 film. The adsorption rates of all the dyes were fast. The pre-adsorption of dyes had little effect on the catalytic degradation of dyes on PAM/CA/T film. The PAM/CA/T hydrogel film provided a suitable carrier for TiO2 in the photocatalytic degradation of dyes and the degradation efficiency of PAM/CA/T-30 film for methyl orange reached 80.76%. The PAM/CA/T film had good reusability and could degrade dyes in NaCl solution.
      Citation: Functional Materials Letters
      PubDate: Fri, 06 Feb 2015 01:36:35 GMT
      DOI: 10.1142/S1793604715400147
  • A novel high color purity yellow luminescent material NaBaBO3:Sm3+
    • Authors: Jianghui Zheng, Jia Feng, Qijin Cheng, Ziquan Guo, Lihan Cai, Chao Chen
      Abstract: Functional Materials Letters, Ahead of Print.
      Yellow emitting Sm3+-doped NaBa1-xBO3(0.01 ≤ x ≤ 0.13) phosphors were synthesized by conventional solid state reaction method. The phase structure and luminescence properties of the as-prepared phosphors were investigated. These phosphors can be effectively excited by 403 nm near-ultraviolet light and feature a satisfactory yellow performance. The emission peaks are observed at 560 nm, 603 nm and 650 nm, originating from the transitions of 4G5/2 → 6H5/2, 4G5/2 → 6H7/2 and 4G5/2 → 6H9/2 respectively. Investigation of Sm3+ concentration-dependent emission spectra indicates that the NaBa0.95BO3:0.05Sm3+ phosphor shows the strongest yellow emission intensity and exhibits the CIE value of x = 0.4760 and y = 0.5090. Through the theoretical calculation, a high color purity of 96.0% was determined for the NaBaBO3:Sm3+ phosphor, and the color purity of NaBaBO3:Sm3+ is much higher than that of the commercial yellow phosphor YAG:Ce3+. This work is highly relevant to the development of a new type of potential down-conversion (DC) yellow phosphor for near ultraviolet white or yellow light-emitting diodes (LEDs).
      Citation: Functional Materials Letters
      PubDate: Fri, 06 Feb 2015 01:36:35 GMT
      DOI: 10.1142/S1793604715500423
  • Ferritin-mediated biomimetic synthesis of bimetallic Au–Ag
           nanoparticles on graphene nanosheets for electrochemical detection of
           hydrogen peroxide
    • Authors: Li Wang, Jiku Wang, Pengjuan Ni, Zhuang Li
      Abstract: Functional Materials Letters, Ahead of Print.
      We demonstrated a biomimetic green synthesis of bimetallic Au–Ag nanoparticles (NPs) on graphene nanosheets (GNs). The spherical protein, ferritin (Fr), was bound onto GNs and served as the template for the synthesis of GN/Au–Ag nanohybrids. The created GN/Au–Ag nanohybrids were further utilized to fabricate a non-enzymatic amperometric biosensor for the sensitive detection of hydrogen peroxide (H2O2), and this biosensor displayed high performances to determine H2O2 with a detection limit of 2.0 × 10-6 M and a linear detection range from 2.0 μM to 7.0 mM.
      Citation: Functional Materials Letters
      PubDate: Fri, 06 Feb 2015 01:36:35 GMT
      DOI: 10.1142/S1793604715500447
  • Fabrication and photocatalytic performance of electrospun PVA/silk/TiO2
           nanocomposite textile
    • Authors: Ming-Chung Wu, Shun-Hsiang Chan, Ting-Han Lin
      Abstract: Functional Materials Letters, Ahead of Print.
      Many organic/inorganic nanocomposites have been fabricated into fibrous materials using electrospinning techniques, because electrospinning processes have many attractive advantages and the ability to produce relatively large-scale continuous films. In this study, the polyvinyl alcohol (PVA)/silk/titanium dioxide (TiO2) nanocomposite self-cleaning textiles were successfully produced using electrospinning technique. After optimizing electrospinning conditions, we successfully obtained the PVA/silk/TiO2 nanocomposite fibers with average diameter of ∼220 nm and TiO2 concentration can be as high as 18.0 wt.%. For the case of the PVA/silk/TiO2 nanocomposite textile, the color of brilliant green coated on the textile surface changed from the initial green color to colorless after ultraviolet (UV) irradiation. Because of its worthy photocatalytic performance, the developed PVA/silk/TiO2 nanocomposite materials in this study will be beneficial for the design and fabrication of multifunctional fibers and textiles.
      Citation: Functional Materials Letters
      PubDate: Thu, 15 Jan 2015 03:39:28 GMT
      DOI: 10.1142/S1793604715400135
  • Influence of Sm3+ doping on microstructure and electrical properties of
    • Authors: Jia-Hu Ouyang, Cheng Zhu, Zhan-Guo Liu, Zhe Ren, Lin Jing
      Abstract: Functional Materials Letters, Ahead of Print.
      (Nd0.7Yb0.3)2Zr2O7 and ((Nd0.7Yb0.3)1-xSmx)2Zr2O7(0 < x ≤ 0.25) ceramics have been synthesized by pressureless sintering by tailoring the chemical compositions. Microstructure and electrical conductivity of ((Nd0.7Yb0.3)1-xSmx)2Zr2O7 were investigated by X-ray diffraction, Raman spectroscopy, scanning electron microscopy and AC impedance spectroscopy. (Nd0.7Yb0.3)2Zr2O7 ceramic exhibits a mixed crystal structure of defect fluorite and pyrochlore. After doping with Sm3+ cations, the structure changes from a mixed type of (Nd0.7Yb0.3)2Zr2O7 to a single pyrochlore type of ((Nd0.7Yb0.3)1-xSmx)2Zr2O7, as the addition of Sm3+ reduces the difference in ionic radius between Nd3+ and Yb3+. However, ((Nd0.7Yb0.3)1-xSmx)2Zr2O7 ceramics contain the localized short-range disorder despite the structural order overall in the pyrochlore. The measured total conductivities of ((Nd0.7Yb0.3)1-xSmx)2Zr2O7 obey the Arrhenius relation. Doping of Sm3+ enhances the electrical conductivity of (Nd0.7Yb0.3)2Zr2O7 ceramic significantly, which is closely related to the variations in the concentration of oxygen vacancies at 48f sites, relatively low activation energy and high pre-exponential factor caused by the long-range order and short-range disorder.
      Citation: Functional Materials Letters
      PubDate: Thu, 15 Jan 2015 03:39:27 GMT
      DOI: 10.1142/S1793604715400123
  • Magnetic and dielectric properties of 3Y-TZP/strontium doped barium
           ferrite composite
    • Authors: Chao Zhang, Shan-Shan Wang, Rui-Song Guo, Guang-Lan Cai, Wei-Na Guo, Chen Wu
      Abstract: Functional Materials Letters, Ahead of Print.
      Magnetic and dielectric properties of 3Y-TZP/20 wt.% Ba1-xSrxFe12O19(x = 0, 0.25, 0.5, 0.75) composites prepared by solid state reaction method are investigated. The magnetic properties are improved in the composites with the strontium doped barium ferrite. When x = 0.25, the saturation magnetization of the ferrite reaches the maximum. This is due to the migration of Fe3+ induced by the Sr2+ doping. The dielectric properties are also improved in the composite with the strontium doped barium ferrite. When x = 0.5, the dielectric constant and dielectric loss possess the maximum. This is caused by the lattice distortion resulting from the Sr2+ doping. The dielectric properties are analyzed by the universal relaxation law.
      Citation: Functional Materials Letters
      PubDate: Wed, 14 Jan 2015 02:59:28 GMT
      DOI: 10.1142/S179360471550040X
  • Synthesis and physical properties of quasi-one-dimensional magnetic
           material Ca3LiRuO6
    • Authors: Dapeng Wu, Yang Qi
      Abstract: Functional Materials Letters, Ahead of Print.
      Ca3LiRuO6 single crystals were grown using the flux method, magnetic properties measurement results along different directions of needle-like single crystals are reported for the first time and show Ca3LiRuO6 occurs a paramagnetic (PM)-weak ferromagnetic (FM) transition at a temperature Tc = 120 K, also the magnetic moment aligns in the ab plane. Although Ca3LiRuO6 is characterized by one-dimensional configuration in crystallographic structure, it has three-dimensional (3D) magnetic order, the value of Tc is far below the magnitude of Curie–Weiss temperature. Θcw ≈ -306 K indicates complex nature of the magnetism is in this compound.
      Citation: Functional Materials Letters
      PubDate: Fri, 09 Jan 2015 08:22:45 GMT
      DOI: 10.1142/S1793604715500393
  • Shape memory effect of laser welded NiTi plates
    • Authors: J. P. Oliveira, F. M. Braz Fernandes, N. Schell, R. M. Miranda
      Abstract: Functional Materials Letters, Ahead of Print.
      Laser welding is a suitable joining technique for shape memory alloys (SMAs). This paper reports the existence of shape memory effect (SME) on laser welded NiTi joints, subjected to bending tests, and correlates this effect with the microstructural analysis performed with X-ray diffraction (XRD). All welded samples were able to recover their initial shape after bending to 180°, which is a remarkable result for industrial applications of NiTi involving laser welding.
      Citation: Functional Materials Letters
      PubDate: 2015-06-04T04:14:59Z
      DOI: 10.1142/S1793604715500691
  • Effect of crystal size distribution on thermoelectric performance for
           Lanthanum-doped strontium titanate bulk material
    • Authors: Boyu Zhang, Jun Wang, Xinba Yaer, Zhenzhen Huo, Yin Wu, Yan Li, Lei Miao, Chengyan Liu, Tao Zou, Wen Ma
      Abstract: Functional Materials Letters, Ahead of Print.
      Effect of crystal size distribution on thermoelectric performance of Lanthanum-doped strontium titanate (La-SrTiO3) ceramics are investigated in this study. Thermoelectric performance measurement, coupled with microstructure studies, shows that the electrical conductivity strongly depends on the crystal size, potential barrier on the grain boundary and porosity. Meantime, because the average potential barriers height are increased along with the reduction of crystal size, the Seebeck coefficients are increased by energy filtering effect at the large number of grain boundaries. As a result, by controlling of crystal size distribution, ZT value of La-SrTiO3 is improved.
      Citation: Functional Materials Letters
      PubDate: 2015-06-04T04:14:58Z
      DOI: 10.1142/S1793604715500708
  • Functionalization of graphene with hyperbranched polyglycerol for stable
           aqueous dispersion
    • Authors: Ning Cai, Dajun Hou, Liang Shen, Xiaogang Luo, Yanan Xue, Faquan Yu
      Abstract: Functional Materials Letters, Ahead of Print.
      The application of graphene for some particular fields including biomedical engineering was hindered by its poor aqueous dispersivity and hydrophobic property. In this study, the strategy of the functionalization of graphene with hyperbranched polyglycerol (HPG) by a facile procedure was proposed. By the epoxy ring-opening hyperbranched polymerization of glycidol, graphene surface was grafted with HPG layer with rich hydroxyl groups. The content of polyglycerol on HPG functionalized graphene (HPG-G) was determined to be 55%. The results of fourier transform infrared (FTIR), X-ray diffraction (XRD), Raman, X-ray photoelectron spectroscopy (XPS) and UV–Vis demonstrated that HPG was successfully grafted onto graphene sheets (GSs), and the aromatic and crystalline structure of graphene was maintained after HPG functionalization. The obtained HPG-G composites possess high hydrophilicity and can be dispersed well in water. Furthermore, no discernable precipitation was found in HPG-G aqueous solution even after three months of storage.
      Citation: Functional Materials Letters
      PubDate: 2015-06-02T06:06:15Z
      DOI: 10.1142/S179360471550068X
  • Electrochemical and energetic characteristics of new dye-sensitizers for
           photovoltaic cells
    • Authors: Igor Kobasa, Lyubomyra Odosiy, Iryna Kurdyukova, Olexandr Ishchenko, Stefan Kurek
      Abstract: Functional Materials Letters, Ahead of Print.
      The influence of the dye structure on the spectral and electrochemical characteristics has been investigated for a series of the anionic and intraionic polymethine dyes (PDs) of the tetranitrofluorene family. The reduction and oxidation potentials were determined by cyclic voltammetry (CVA), and HOMO and LUMO energy levels were calculated in order to predict the applicability of the dyes as TiO2 sensitizing agents. Some types of the PD/TiO2 heterostructures (HSs) were built and their photocatalytic activity (PA) was determined using the model reaction of iodide anion oxidation.
      Citation: Functional Materials Letters
      PubDate: 2015-05-18T01:30:01Z
      DOI: 10.1142/S1793604715500678
  • Competition between compressive strain and Mn doping on tuning the
           structure and magnetic behavior of BiFeO3 thin films
    • Authors: Jingyi Chen, Yao Wang, Yuan Deng
      Abstract: Functional Materials Letters, Ahead of Print.
      BiFe1-xMnxO3 (BFMO) films (x = 0, 0.05, 0.1) were grown on (001) LaAlO3 (LAO) substrates to demonstrate the role of chemical pressure on the lattice structure and magnetic behaviors of compressively-strained BiFeO3 (BFO) films. The structural analyses indicated that the substitution of Jahn–Teller active ion Mn at Fe site tuned the ferroelectric distortion and antiferrodistortive (AFD) rotation in BFO lattice, thus weakened the tetragonal-like (T-like) phase originated from the large substrate clamping. The phase transition mechanism was discussed to reveal the competition between inner lattice distortion and external stress in BFO films. Clear domain variants change from (T-like) phase to rhombohedral-like (R-like) phase provided further evidence for the structure alteration. Meanwhile the gradual relaxation in total lattice strain of BFMO films with increasing x reduced the magnetism contribution from the strong spin and lattice coupling.
      Citation: Functional Materials Letters
      PubDate: 2015-05-08T03:32:56Z
      DOI: 10.1142/S1793604715500666
  • First-principles investigation of possible martensitic transformation and
           magnetic properties of Heusler-type Pt2-xMn1+xIn alloys
    • Authors: Lin Feng, Wenxing Zhang, Enke Liu, Wenhong Wang, Guangheng Wu
      Abstract: Functional Materials Letters, Ahead of Print.
      The phase stability, electronic structure and magnetism of Pt2-xMn1+xIn (x = 0, 0.25, 0.5, 0.75, 1) alloys are studied by first-principles calculations. The possible magnetic martensitic transformation in this series has been investigated. For all the five compounds, the energy minimums occur around c/a = 1.30, and the energy differences between the austenitic and martensitic phases are large enough to overcome the resistance of phase transformation. By comparing the electronic structures of austenitic and martensitic phases, we can find that the phase stability is enhanced by the martensitic transformation. The magnetic structures of the austenitic and martensitic phases are also discussed.
      Citation: Functional Materials Letters
      PubDate: 2015-05-04T04:08:05Z
      DOI: 10.1142/S1793604715500642
  • Piezoelectric performance — composition relations in anisotropic
           materials based on Pb0.85Ca0.15-xCdxTi0.9Zr0.1O3 phases
    • Authors: Alexey A. Nesterov, Vitaly Yu. Topolov, Anatoly E. Panich
      Abstract: Functional Materials Letters, Ahead of Print.
      The effect of processing methods and a composition of ferroelectric (FE) (piezoelectric) phases on forming a microstructure of a ceramic framework during poling is studied in a ceramic material of the composition Pb0.85Ca0.15-xCdxTi0.9Zr0.1O3. A transition from using the solid-phase method for the synthesis of powder of a particular phase to a method of bulk "chemical assembly" leads to a change in the mechanical strength of the bulk granular medium and intergranular boundaries therein. Depending on a relationship between mechanical strength parameters of the studied materials, on poling the samples with a particular composition, anisotropic piezo-active composite materials with various connectivities of Pb0.85Ca0.15-xCdxTi0.9Zr0.1O3 phases can be obtained. These materials are characterized by various combinations of electrophysical properties and demonstrate advantages over the known anisotropic PbTiO3-type ceramics. The fracture of ceramic grains during the poling process can be intensified by introducing FE phases with the composition comprising Cd2+ ions with a smaller radius and a most deformability in comparison to the Ca2+ ion.
      Citation: Functional Materials Letters
      PubDate: 2015-05-04T04:08:05Z
      DOI: 10.1142/S1793604715500654
  • Large-scale and facile fabrication of PbSe nanostructures by selenization
           of a Pb sheet
    • Authors: Sara Hoomi, Ramin Yousefi, Farid Jamali-Sheini, Abdolhossein Sáaedi, Mohsen Cheraghizade, Wan Jefrey Basirun, Nay Ming Huang
      Abstract: Functional Materials Letters, Ahead of Print.
      PbSe nanostructures were synthesized by selenization of lead sheets in a chemical vapor deposition (CVD) set-up under a selenium ambiance. The lead sheets were placed in the different temperature zones, between 300°C and 450°C. Field emission scanning electron microscope (FESEM) images showed that, PbSe nanostructures grown on the lead sheets with different morphologies. PbSe nanostructures with flakes shape were grown on the lead sheets that were placed in the lower temperature, while PbSe nanocubes and nanorods, which were grown on the nanocubes, were grown on the lead sheets in the higher temperature. The phase and composition of the product were identified by X-ray diffraction (XRD) pattern and X-ray photoelectron spectra (XPS). The XRD and XPS results showed that, the PbSe phase was started to form after 350°C and completed at 450°C. However, the XPS results showed that the Se concentration was different in the samples. In addition, Raman measurements confirmed the XRD and XPS results and indicated three Raman active modes, which belonged to PbSe phase for the nanostructures. The optical properties of the products were characterized by UV–Vis. The optical characterization results showed a band gap for the PbSe nanostructures in the infrared region.
      Citation: Functional Materials Letters
      PubDate: 2015-04-27T02:10:13Z
      DOI: 10.1142/S1793604715500630
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