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Physics of the Solid State
Journal Prestige (SJR): 0.415  Citation Impact (citeScore): 1 Number of Followers: 4  Hybrid journal (It can contain Open Access articles)ISSN (Print) 1090-6460 - ISSN (Online) 1063-7834 Published by Springer-Verlag  [2468 journals]
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- Microstructural, Morphological, and Magnetic Features of the Triple
Perovskite Oxide La3Mn2FeO9-
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Abstract: Triple perovskite La3Mn2FeO9 powder was synthesized via the sol gel method. The microstructural, morphological and magnetic features of the prepared perovskite sample were examined by means of X‑ray diffraction (XRD), filed-emission scanning electron microscopy (FE-SEM), and vibrating sample magnetometry (VSM). The XRD pattern was refined using the MAUD software based on the Rietveld program. The results confirmed that the sample crystallized in a trigonal structure, with a crystallite size measuring approximately 257 ± 5 nm and a microstrain of about 0.16%. The FE-SEM image revealed spherical like-particles with an average grain size in the vicinity of 514 nm. The VSM curve revealed that the prepared La3Mn2FeO9 powder exhibited a ferromagnetic behavior, and subsequent fitting using the law of approach to saturation revealed a saturation magnetization of 1.156438 ± 0.00384 emu/g.
PubDate: 2024-06-01
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- Production and Characterization of Zn1 – xFexS Thin Films by Ultrasonic
Chemical Spray Deposition Technique-
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Abstract: In this study, Zn1 – xFexS thin films were synthesized using the chemical spray pyrolysis technique at a substrate temperature of 450°C and with varying Fe concentrations. The spraying solution was prepared by combining distilled water with 0.05 M zinc chloride (ZnCl2), 0.05 M iron chloride (FeCl3⋅6H2O), and 0.2 M thiourea ((NH2)2CS). The initial solution was atomized onto heated glass substrates using an ultrasonic nebulizer operating at a frequency of 1.63 MHz and dry air. The morphology of the films was examined by scanning electron microscopy (SEM). The crystal structures were determined by X-ray diffraction analysis (XRD). The optical properties of the films were analyzed using a UV spectrometer. The energy band gap of the films was defined using the absorption spectrum.
PubDate: 2024-06-01
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- Impact of AlN Buffer Layer Thickness on Electronic and Electrical
Characteristics of In0.17Al0.83N/GaN High-Electron-Mobility Transistor-
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Abstract: In this paper, we delved into the intricacies of In0.17Al0.83N/GaN high-electron-mobility transistors (HEMTs) using a comprehensive simulation model and by Leveraging the capabilities of Nextnano simulation software. We extensively explored how different thicknesses of the AlN buffer layer impact electronic and electrical properties. Our study was centered on scrutinizing the density and mobility of the two-dimensional electron gas (2-DEG) within the In0.17Al0.83N/GaN HEMT structure. Aiming to understand how different AlN buffer layer thicknesses impact device performance. Our findings unveil a crucial relationship between AlN buffer layer thickness and critical performance metrics. Specifically, we observed significant trends in output current and transconductance, shedding light on the direct influence of AlN thickness on device behavior. Our simulations identified an optimal AlN thickness of 350 nm, demonstrating the highest output current and surpassing a transconductance peak of 510 mS/mm. Importantly, our computational predictions closely align with experimental observations, validating the reliability and accuracy of our simulation model. Through this meticulous analysis, we contribute valuable insights that can guide the design and optimization of In0.17Al0.83N/GaN HEMT, paving the way for improved device performance and functionality across various electronic applications. Our study underscores the importance of considering AlN buffer layer thickness in designing and engineering high-performance HEMTs, highlighting avenues for future research and development in semiconductor device technology.
PubDate: 2024-06-01
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- Theoretical Calculation of the Structural, Electronic, and Magnetic
Properties of a New Rare-Earth Based Full Heusler Alloys Pr2CoZ (Z = Al,
Ga, In)-
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Abstract: The full potential linearized augmented plane wave (FP-LAPW) method, employing density functional theory (DFT) within the generalized gradient approximation (GGA), is utilized to investigate the structural, electronic and magnetic characteristics of the rare earth element based Pr2CoX (X = Al, Ga, In) full Heusler compounds. The results indicate that, at the equilibrium volume, the Hg2CuTi-type structure is energetically more stable than the Cu2MnAl-type structure for Pr2CoX (X = Al, Ga, In). The electronic band structure of Pr2CoX (X = Al, Ga, In) reveals an indirect band gap with the minority spin, suggesting half-metallic behavior. The calculations of magnetic properties affirm the half-metallic nature of these compounds, with total magnetic moment of 3.99 μB.
PubDate: 2024-06-01
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- Theoretical Study of Symmetrical 1D Photonic Crystal as a Blood Cancer
Sensor-
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Abstract: In this work, we studied by simulation the performance of a cancer sensor based on 1D symmetrical photonic crystal. The proposal 1D photonic crystal structure is (AB)5C(BA)5 where A = TiO2 with high refractive index, B = SiO2 with low refractive index and layer C is a blood cell. The study was conducted using the Transfer Matrix method (TMM) method. So, the transmissions spectra, the sensitivity as well as the quality factor of the sensor for different blood cell samples including normal blood cells and various cancerous blood cells: Jurkat, HeLa, PC-12, MDA-MB-231, and MCF-7 were obtained. The obtained results have shown the improvement in the performance of the proposal 1D photonic crystal sensors, namely sensitivity and quality factor, as a function of the thickness of the sample layer C and the angle of incidence in case of the two polarization mode.
PubDate: 2024-05-01
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- Study of the Effect of Exchange and Correlation Potential on the
Electronic Properties of Mercury Chalcogenides-
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Abstract: In this work, we present first-principles DFT calculations to predict the structural and electronic properties of HgX (X = S, Se, and Te) compounds. First-principles methods using the local density approximation (LDA) and generalized gradient approximation (GGA) lead to an underestimation of the band gap energy. The objective of this work is to use various exchange and correlation potentials (LDA, GGA-PBE, EVGGA, MBJGGA, MBJLDA, etc.) to determine the band gap energy and electronic properties. We show that the use of the modified Becke–Johnson (mBJ) approximation leads to very good agreement with the experimental band gap energies for mercury chalcogenides.
PubDate: 2024-05-01
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- First-Principles Study of Structural Stability and Tensile Strengths of
Light-Element-Doped ZrTi-
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Abstract: ZrTi alloys have potential applications in critical parts of spacecraft. As lightweight design is a fundamental requirement for spacecraft, incorporating light elements into ZrTi alloys is a feasible approach. In this paper, we investigated the tensile deformation behavior of ZrTi doped with light element by using the plane-wave pseudopotential density functional method. Covalent Ti–Zr bonds accommodate deformation by softening and breaking at large tensions, and structural stability of ZrTi and ZrTiX (X = B, Al, Ga, and V) is determined by the strength of these Ti–Zr bonds under tension. The results show that the lower doped concentrations of light element decrease the tensile strengths. However, there is no obvious difference in tensile strengths along [11 \(\bar {2}\) 0] direction between ZrTi and ZrTi0.875Al0.125. The results of Mulliken overlap populations indicate that different tensile strengths of ZrTiX should be resulted from different strengths of covalent Ti–Zr bonds. The incorporation of light element dopants does not strengthen all chemical bonds and weakens strengths of covalent Ti–Zr bonds, indicating that experimental strengthening mechanism of ternary ZrTiX alloys could be ascribed to Hall–Petch effect.
PubDate: 2024-05-01
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- Effect of Temperature and Pressure on Low-Frequency Raman Scattering from
Strontium Tantalate Ceramic Material-
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Abstract: The temperature and pressure dependences of low-frequency Raman scattering were studied on structural phase transformations of Sr2Ta2O7 ceramics. The Raman spectrum was measured over a temperature range from 0 to –185°C. The temperature dependence of the Raman shift of a low-lying mode of the B1g symmetry shows at T = –110°C. This anomaly of Sr2Ta2O7 is related to a ferroelectric phase transition. During cooling, the peak width of the B1g mode shows a change at 150°C, and the temperature dependence of Raman shifts of B3g, and B1g modes becomes abnormal. Under high pressure, we discovered a phase transition between 4 and 5.5 GPa. Angle-dispersive X-ray diffraction data suggest the phase transition from incommensurate to commensurate states.
PubDate: 2024-05-01
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- Fabrication and Optical Characteristics of Thin Films Comprising VO2 and
SnO2-
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Abstract: As the demand for sustainable energy solutions rises, the development of energy-efficient technologies becomes imperative. Smart windows, incorporating thermochromic materials, emerge as promising contributors to reducing building energy consumption. Vanadium dioxide (VO2), known for its thermochromic properties, faces challenges in commercial application due to its limited visible light transmittance. This study addresses these challenges by utilizing quartz as a substrate and depositing VO2 thin films using radio frequency sputtering. To enhance optical performance, a bilayer structure was created by integrating this single-layer film with SnO2. Room-temperature X-ray diffraction confirmed the single-phase growth of VO2 on quartz, and XRD validated the proper fabrication of films. Ultraviolet-visible spectroscopy at room temperature substantiated the improved transmittance of the SnO2/VO2 bilayer, marking a significant advancement toward more efficient and commercially viable smart windows. This research highlights the potential of SnO2-based thin films in mitigating the visible light transmittance limitations of VO2, thus opening avenues for advanced smart window applications with enhanced energy-saving capabilities. Additionally, Atomic Force Microscopy (AFM) was employed to compare the roughness of the films, and the impact of reduced roughness on optical transmittance was evaluated. The results contribute to the optimization of smart window technologies for broader sustainable energy applications.
PubDate: 2024-04-01
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- Mobility Characteristics of ZnMgO/ZnO Heterostructures with Screening
Effects-
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Abstract: The electron mobility characteristics of a ZnMgO/ZnO heterostructure are systematically investigated by an ensemble Monte Carlo method. Screening effects are included in all electron scattering mechanisms. The mobilities are calculated for a temperature range of 4 to 300 K and Mg contents ranging from 8.5 to 44%. In this range, dislocation scattering (DS) and interface roughness scattering (IFR) are highly effective for low and high values of Mg compositions, respectively. Screening effects must be considered in scattering mechanisms to achieve a reasonable agreement with existing experimental results. Our findings could be significant for the design and optimization of ZnO-based devices.
PubDate: 2024-04-01
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- Exploring the Spin Torque Diode Effect in Low Dimensional Magnetic
Multilayer Structure-
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Abstract: This study investigates the impact of spin torque diode (STD) effect in a composite spin valve pillar, comprising distinct magnetic and non-magnetic layers arranged as AF/F0/NM1/F1/NM2/F2. Our investigation delves into the foundational mechanisms governing the STD effect within this magnetic multilayer system. Through the utilization of the composite spin valve pillar as a dynamic platform, we unravel the intricate interplay between spin-dependent charge transport and magnetic fields. Our inquiry is to understand diverse structural parameters, allowing us to unveil its operational capabilities and optimize its functionality across varied operating conditions. Furthermore, our exploration encompasses the quantification of detection sensitivity, scrutinizing the relationship between output voltage and applied input power. In our study, we have done an analysis of crucial parameters such as current, resistance, and sensitivity in the STD system. Our findings showcase the manifestation of the spin diode effect in low-dimensional magnetic structure. This finding indicates the feasibility of fabricating a spin diode device with diverse potential applications.
PubDate: 2024-04-01
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- Temperature Sensor Based on Deformed One-Dimensional Nanometallic Photonic
Crystals-
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Abstract: The theoretical investigation of the temperature dependence in hybrid one-dimensional photonic crystals with a metal defect involved simultaneously considering thermal expansion effect and thermal-optical effect. Firstly, we study the effect of the number of iterations in the H(LH)NH(LH)N and H(LH)NSH(LH)N systems, where H (GaAs) and L (Bi4Ge3O12 “BGO”) are two different materials with constant refractive index nH (nGaAs = 3.3) and nL (nBGO = 2.31), respectively. S is a metal chosen as the Ag. The presence of metal S enhances noticeably the sensitivity for the temperature. It has been shown that when N increases the transmission peak λpeak shifts to higher wavelengths for the structure H(LH)NH(LH)N. We show that the proposed device H(LH)NSH(LH)N can be used as a temperature sensor. Indeed, the sensitivity changes from the value 4.5 pm K–1 in the absence of the metal layer to the value 17 pm K–1 in its presence. Enhancing the sensitivity of the H (LH)NSH(LH)N component, we proceeded to a deformation of the system by the application of a law of the type y = x1 + k, where y denotes the deformation coordinate of the structure H(LH)NSH(LH)N and x the coordinate before deformation. The degree of deformation is defined by the coefficient k. The value of N is chosen equal to 4. This value corresponds to the minimum of layers of the system leading to its satisfactory performance. We show in this case that the sensitivity increases by increasing the positive value of k.
PubDate: 2024-04-01
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- Exploring Calcium–Zinc Ferrite Nanoparticles: Synthesis, Properties,
and Applications-
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Abstract: This study focuses on the synthesis and characterization of calcium–zinc Ca1–xZnxFe2O4 (x = 0, 0.25, 0.50, 0.75, 1.0) (Ca–Zn) ferrite nanoparticles by the solution combustion synthesis (SCS), exploring their potential applications in various technological fields. The characterization involved a comprehensive analysis of their structural, magnetic, and morphological features using various techniques such as X-ray diffraction, transport properties, biological studies and magnetic measurements. Understanding the synthesis process and the resulting nanoparticle properties is crucial for harnessing their unique attributes in diverse fields like biomedical engineering, magnetic storage.
PubDate: 2024-03-01
DOI: 10.1134/S1063783424600468
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- Transport and Localization in Quantum Dot Chains with Fluctuations: A
Simple Probabilistic Model-
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Abstract: In this study, we obtain an expression to calculate the probability of electron transmission in a linear chain of N quantum dots with fluctuations of the potential levels on the Fermi seas of each point. Here, the transmission probability model is based on concepts of Probability Theory. From this expression, we determine the transmission in the chain under these fluctuations. Besides, Anderson localization and other transport properties were studied using numerical simulations. Results show the impact of fluctuations on transmission efficiency and aid in comprehensively understanding electron transport in quantum dot systems.
PubDate: 2024-03-01
DOI: 10.1134/S1063783424600584
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- Effect on Structural, Morphological, and Magnetic Hysteresis of
Ni2+–Zr4+ Co-Substituted Barium Hexaferrites by Hydrothermal Synthesis-
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Abstract: BaFe12–2xNixZrxO19 (x = 0–1) ferrites were successfully synthesized by hydrothermal method based on metal chloride. The synergistic effects of Ni2+–Zr4+ ions doping and heat treatment on microstructure and ions distribution to tailoring the magnetic properties were studied. Without calcination the traces of BaCO3 appears in all samples where the Fe2O3 phase appears at x > 0.6. It exhibits very good hexagonal crystals with doping content x < 0.8, but deviate from hexagonal flakes for x = 1. With low temperature 950°C calcination, the pure phase and the uniform distribution of particle size were obtained. XPS characterization show that the concentrations of non-lattice oxygen decrease, where Fe2+ contents slightly increase and then decrease with increasing Ni2+–Zr4+ ions. The comprehensive magnetic properties, especially the saturation magnetization, of doped ferrites prepared by hydrothermal method decrease sharply when x > 0.6. The anisotropy field also decreases to the lowest at x = 0.6. By comparing the magnetic properties under heat treatment conditions, the optimum annealing temperature is 1000°C, where the saturation magnetization (Ms) increases up to 59.54 emu/g at x = 0.8. Thus, the as-synthesized Ni2+–Zr4+ doping strontium barium hexaferrite will be useful for the applications in security switching, microwave absorption and recording media.
PubDate: 2024-03-01
DOI: 10.1134/S1063783424600547
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- Study of Optical and Magnetic Properties of Solvothermally Synthesized
Mn/Fe/N-Doped ZnO Nanocomposite for Advanced Dye Photodegradation-
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Abstract: In this research, a mesoporous Mn/Fe/N-doped ZnO nanocomposite was developed via solvothermal synthesis, focusing on its optical and magnetic potentials for dye degradation. FTIR spectroscopy identified unique functional groups, while EDX analysis confirmed its elemental composition. BET analysis showcased an expanded surface area due to mesoporosity, evidenced by a type IV isotherm. UV-Visible spectroscopy revealed a red shift and optical band gap reduction from 3.13 to 2.68 eV, indicating improved light absorption. SEM provided insights into distinctive morphologies, and PL studies showed reduced electron-hole recombination in highly doped samples. SQUID measurements verified the nanocomposite’s ferromagnetic characteristics. These properties collectively enhance its photocatalytic efficacy against Congo red and Methylene blue dyes, presenting a viable solution for environmental clean-up.
PubDate: 2024-03-01
DOI: 10.1134/S1063783424600705
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- On the Problem of Generalization of the Landau–Lifshitz Equation
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Abstract: Using the method of compiling an expression invariant with respect to the operations of inversion of time and coordinates for the energy of a magnetic structure under the influence of some external effective field which is considered an independent vector parameter of the problem, a system of differential equations generalized the Landau–Lifshitz and Hilbert results is obtained. When obtaining these equations, the explicit expression for the dissipative function are obtained taking into account the pseudovector the nature of the magnetic field strength. The analysis of the obtained equations for the case of strong magnetic fields is carried out and the possibility of the existence of practically continuous oscillations of the magnetization at a frequency \(\bar {\omega }\) = \(\xi {{\gamma }_{e}}{{M}_{0}}\) (where coefficient ξ is greater than unity) is predicted.
PubDate: 2024-02-01
DOI: 10.1134/S1063783424600432
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- Thermal and Diffusion Processes during Electron Beam Processing of
Surfaces of Electroexplosive Alloying-
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Abstract: The mechanisms of hardening surface layers of carbon steel 45 after combined treatment including electroexplosive boroaluminizing, aluminizing with silicon carbide, and electron beam processing (EBP) are revealed. The combined processing leads to an increase in the hardening depth. After the electroexplosive boroaluminizing and EBP, the microhardeness is 16 GPa and the hardening depth is 90 μm; after the electroexplosive aluminizing combined with silicon carbide and EBP, the microhardness is 12.5 GPa and the hardening depth is 50 μm. In the initial state, the microhardness is 2 GPa. In the conditions of dry sliding friction, the wear resistance increases by a factor of 43 after electroexplosive boroaluminizing and EBP, and by a factor of 12 after electroexplosive aluminizing with silicon carbide. The surface hardening is achieved as a result of the formation of fine-disperse nonequilibrium structure containing strengthening phases. The models developed in this work allow one to explain the results by the peculiarities of the thermal and diffusion processes during EBP.
PubDate: 2024-02-01
DOI: 10.1134/S1063783424600523
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- First-principles Study on the Lattice Thermal Conductivity of Janus
In2Ge2Te6 Bilayer-
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Abstract: Janus In2Ge2Te6 bilayer exhibit the potential for low thermal conductivity due to their complex geometry and large atomic mass contrast. The results demonstrate that the intersection of the low-frequency optical branch and the longitudinal acoustic phonon branch (LA) within the Janus In2Ge2Te6 bilayer structure, combined with a larger average atomic mass, leads to a smaller phonon group velocity, a higher phonon scattering rate, a lower phonon relaxation time, and a stronger anharmonicity. These factors contribute to the lower thermal conductivity of the Janus In2Ge2Te6 bilayer. The Janus In2Ge2Te6 bilayer structure exhibits a maximum and minimum lattice thermal conductivity of about 0.35 and 0.1 W/(m K) at 300 and 1000 K, respectively.
PubDate: 2024-02-01
DOI: 10.1134/S1063783424600535
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- XRD Study of Structure Transformations in Zn–In–O Nanocomposite Thin
Films Prepared by Spray Pyrolysis Method-
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Abstract: Structure and composition of spray pyrolized thin films in ZnO–In2O3 system with a relative atomic zinc content (Zn/In) in the range of 0.125–2 is investigated using X-ray diffraction analysis. These nanostructured films constitute of 1 to 5 In- and Zn-based oxide nanocrystalline phases including In2O3(ZnO)3 with superlattice structure and ZnO with rather unexpected rocksalt structure. The octahedral coordination of Zn atoms and practically the same Zn–O distances as in the case of In2O3 facilitate a growth of ZnO rock salt on the surface of In2O3 nanocrystals. The modified Williamson-Hall method is applied to determine the crystallite size and micro-strain in the predominant In2O3 phase. The monotonous crystallite fineness of this phase with increase of Zn content and monotonous increase of In–Zn-based oxide crystallites is established. A mutual doping of In2O3 and ZnO nanocrystallites, leading to the formation of n–n+ contacts at their boundaries, has been revealed. Model representations about the influence of the nanocomposite structure of films on their electrical properties are proposed.
PubDate: 2024-02-01
DOI: 10.1134/S1063783424600596
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