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Journal of Advanced Dielectrics
Journal Prestige (SJR): 0.263
Citation Impact (citeScore): 1
Number of Followers: 1  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2010-135X - ISSN (Online) 2010-1368
Published by World Scientific Homepage  [120 journals]
  • Enhanced ferroelectric and piezoelectric characteristics in Ca-substituted
           [math]ceramics

    • Authors: S. B. Chen, S. Y. Wu, X. M. Chen
      Abstract: Journal of Advanced Dielectrics, Volume 12, Issue 03, June 2022.
      In this work, Ba[math]Ca[math]Ti[math]Zr[math]O3 ([math]= 0.00–0.25) ceramics were prepared by a solid-state reaction method, and the variation of dielectric, ferroelectric and piezoelectric characteristics has been investigated together with the structure evolution. The crystal structure varies from rhombohedral to tetragonal at room-temperature and the morphotropic phase boundary (MPB) is determined around [math]= [math]0.10, where the significantly enhanced ferroelectric and piezoelectric properties are achieved. With the increase of Ca content, the system gradually evolves into a relaxor ferroelectric. This work provides useful guidance for future research on lead-free piezoelectric materials.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-07-14T07:00:00Z
      DOI: 10.1142/S2010135X22500072
      Issue No: Vol. 12, No. 03 (2022)
       
  • Stable large-area monodomain in as-grown bulk ferroelectric single crystal
           Sn2P2S6

    • Authors: Yingzhuo Lun, Jiaqian Kang, Wenfu Zhu, Jianming Deng, Xingan Jiang, Cheng Zhu, Qi Ren, Xian Zi, Ziyan Gao, Tianlong Xia, Zishuo Yao, Xueyun Wang, Jiawang Hong
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      Driven by the minimization of total energy, the multi-domain morphology is preferred in as-grown ferroelectrics to reduce the depolarization and strain energy during the paraelectric to ferroelectric phase transition. However, the complicated multi-domain is not desirable for certain high-performance ferroelectric electro-optic devices. In this work, we achieve a reproducible and stable large-area monodomain in as-grown bulk ferroelectric single crystal Sn2P2S6. The monodomain dominates the entire single crystal, which is attributed to the internal charge carriers from the photoexcited disproportionation reaction of Sn ions. The charge carriers effectively screen the depolarization field and therefore decrease the depolarization energy and facilitate the formation of monodomain. This work offers a potential approach for engineering bulk ferroelectrics with a stable monodomain, which is desirable for the high-performance ferroelectric electro-optic devices.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-08-04T07:00:00Z
      DOI: 10.1142/S2010135X22430019
       
  • Dielectric spectroscopy of solid solutions based on
           sodium-potassium–cadmium in the temperature range (10 ÷ 900) K

    • Authors: M. O. Moysa, K. P. Andryushin, A. V. Pavlenko, S. P. Kubrin, L. A. Reznichenko
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      This paper studies the dielectric spectra of solid solutions (SS) of the system (1 −[math]−[math] )NaNbO3–[math]KNbO3 –[math]CdNb2O6 [math]= 0.075, [math]= 0.05 ÷ 0.30 in the temperature range (10 ÷ 900) K. The formation of a local maximum was established in the interval (260 ÷ 300) K at small [math]values, which, as KNbO3increases, is gradually blurred and becomes an inflection point. Detected in SS with [math] = 0.05 ÷ 0.10, the shift of the maxima of dependences [math]′/ [math]0([math]) and [math]′′/[math]0 ([math]), depending on the frequency of the electric field at the temperature ranges (300 ÷ 304) K and (258 ÷ 271) K, is not related to relaxation. This anomaly may indicate a crystallographic disorder to A and B positions. The conclusion is made about the expediency of using the obtained results for the development of functional ferroactive materials.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-08-03T07:00:00Z
      DOI: 10.1142/S2010135X22440015
       
  • Influence of the aspect ratio of nitrogen-doped carbon nanotubes on their
           piezoelectric properties

    • Authors: Marina V. Il’ina, Olga I. Soboleva, Nikolay N. Rudyk, Maria R. Polyvianova, Soslan A. Khubezhov, Oleg I. Il’in
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      Recent studies have shown that nitrogen doping of carbon nanotubes (CNTs) can lead to the formation of piezoelectric properties in them, not characteristic of pure CNTs. In this work, nitrogen-doped CNTs were grown by plasma-enhanced chemical vapor deposition and the effect of the aspect ratio of the nanotube length to its diameter on its piezoelectric coefficient [math] was shown. It was observed that as the aspect ratio of the nanotube increased from 7 to 21, the value of [math] increased linearly from 7.3 to 10.7 pm/V. This dependence is presumably due to an increase in curvature-induced polarization because of an increase in the curvature and the number of bamboo-like “bridges” in the nanotube cavity formed as a result of the incorporation of pyrrole-like nitrogen into the nanotube structure. The obtained results can be used in the development of promising elements of nanopiezotronics (nanogenerators, memory elements, and strain sensors).
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-07-07T07:00:00Z
      DOI: 10.1142/S2010135X22410016
       
  • Temperature-activation mechanism of the temperature dependence of the
           dielectric constant of ferroelectric ceramics PZT

    • Authors: D. V. Kuzenko
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      The theoretical possibility of the temperature-activation process of the temperature dependence of the dielectric constant of samples of ferroelectric ceramics lead zirconate titanate (PZT) at temperatures below the Curie point is considered. The model takes into account the 180ˆ∘ motion of the domain wall, which is located in the potential well. The values of activation energies ([math] 0.01, 0.1, 1 eV) were obtained from the experimental dependences of the logarithm of the dielectric constant on the reciprocal temperature. This is associated with three processes: initial vibrations of domain walls; separation of domain walls (DWs) from oxygen vacancies; the motion of DWs as a result of the motion of oxygen vacancies.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-07-06T07:00:00Z
      DOI: 10.1142/S2010135X22500102
       
  • Study on properties of ultra-low dielectric loss mPPO/MTCLT composites
           prepared by injection molding

    • Authors: Yahan Liu, Haiyi Peng, Xiaogang Yao, Minmin Mao, Kaixin Song, Huixing Lin
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      A novel category of polyphenylene oxide/high-impact polystyrene (PPO/HIPS) alloy was used as the polymer matrix (abbreviated as mPPO) and loaded with different volume fractions (0, 10, 20, 30, 40, 50 vol.%) of MgTiO3–Ca[math]La[math]TiO3 (abbreviated as MTCLT) ceramics to prepare composites by injection molding. Its micromorphology, density, dielectric, thermal and mechanical properties were analyzed in detail. The experimental results show that the composites possess a compact microstructure because HIPS increases the fluidity of PPO. Due to the excellent dielectric properties of both mPPO and MTCLT, the composites have an extremely low dielectric loss. The realization of the high ceramic filler fraction greatly limits the thermal expansion of the polymer chain by introducing the interphase, so that the coefficient of thermal expansion of the composite material could be as low as 21.8 ppm/[math]C. At the same time, the presence of ceramic particles could reinforce the mechanical property of the composites. When the ceramic filler fraction is higher than 20 vol.%, the bending strength of the composite material is around 110 MPa. When the ceramic filler fraction is 40 vol.%, the composite possesses the best comprehensive performance. The dielectric constant is 6.81, the dielectric loss is 0.00104, the thermal expansion coefficient is as low as 25.3 ppm/[math]C, and the bending strength is 110.4 MPa. Due to its excellent properties, this material can be a good candidate in the field of microwave communication.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-06-15T07:00:00Z
      DOI: 10.1142/S2010135X22500047
       
  • Experimental search for high-performance ferroelectric tunnel junctions
           guided by machine learning

    • Authors: Jingjing Rao, Zhen Fan, Qicheng Huang, Yongjian Luo, Xingmin Zhang, Haizhong Guo, Xiaobing Yan, Guo Tian, Deyang Chen, Zhipeng Hou, Minghui Qin, Min Zeng, Xubing Lu, Guofu Zhou, Xingsen Gao, Jun-Ming Liu
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      Ferroelectric tunnel junction (FTJ) has attracted considerable attention for its potential applications in nonvolatile memory and neuromorphic computing. However, the experimental exploration of FTJs with high ON/OFF ratios is a challenging task due to the vast search space comprising of ferroelectric and electrode materials, fabrication methods and conditions and so on. Here, machine learning (ML) is demonstrated to be an effective tool to guide the experimental search of FTJs with high ON/OFF ratios. A dataset consisting of 152 FTJ samples with nine features and one target attribute (i.e., ON/OFF ratio) is established for ML modeling. Among various ML models, the gradient boosting classification model achieves the highest prediction accuracy. Combining the feature importance analysis based on this model with the association rule mining, it is extracted that the utilizations of {graphene/graphite (Gra) (top), LaNiO3 (LNO) (bottom)} and {Gra (top), Ca[math]Ce[math]MnO3 (CCMO) (bottom)} electrode pairs are likely to result in high ON/OFF ratios in FTJs. Moreover, two previously unexplored FTJs: Gra/BaTiO3 (BTO)/LNO and Gra/BTO/CCMO, are predicted to achieve ON/OFF ratios higher than 1000. Guided by the ML predictions, the Gra/BTO/LNO and Gra/BTO/CCMO FTJs are experimentally fabricated, which unsurprisingly exhibit [math]1000 ON/OFF ratios ([math]8540 and [math]7890, respectively). This study demonstrates a new paradigm of developing high-performance FTJs by using ML.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-06-15T07:00:00Z
      DOI: 10.1142/S2010135X22500059
       
  • Modeling the effect of uniform and nonuniform dispersion of nanofillers on
           electrical tree propagation in polyethylene dielectric

    • Authors: Khola Azhar, Salman Amin
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      A phase-field model is developed in this paper based on the similarity between mechanical fracture and dielectric breakdown. Electrical treeing is associated with the dielectric breakdown in solid dielectrics by the application of high voltages. Instead of explicitly tracing the propagation of conductive channel, this model initializes a continuous phase field to characterize the extent of damage. So far, limited research has been conducted for simulating the effect of nanofiller dispersion on electrical treeing. No study has modeled the effect of uniform and nonuniform dispersion of nanofillers with varying filler concentration on treeing. Since electrical treeing tends to decrease the breakdown strength of solid dielectrics therefore, nanofillers are widely used to distract the tree from a straight channel to distribute its energy in multiple paths. Diverting a straight treeing channel into multiple paths reduces the chances of its propagation from live to dead-end hence, improving the breakdown strength. The physical and chemical nature of nanofillers has a crucial impact on increasing the resistance to treeing. In this paper, phase-field model is developed and used to simulate electrical treeing in polyethylene for varying concentrations of alumina nanofiller using COMSOL Multiphysics. Tree inception time, tree-growth patterns, and corresponding changes in dielectric strength is studied for both dispersions. Electrical treeing under different concentrations of alumina nanofillers with uniform and nonuniform dispersion is investigated in polyethylene as a base material. It is observed that fillers with uniform dispersion increases the resistance to treeing and tree inception time. Highest resistance to treeing is observed by adding 1% nanoalumina uniformly in raw polyethylene. Moreover, in uniform dispersion the tree deflects into multiple branches earlier than nonuniform dispersion impeding the damage speed as well.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-06-15T07:00:00Z
      DOI: 10.1142/S2010135X22500060
       
  • Hierarchical-vortex polarization domain pattern in nano polycrystalline
           ferroelectric

    • Authors: Zhiyong Huang, Qinan Li, Yin Liang, Xiaoqiao He, Jiagang Wu, Haidong Fan, Xiaobao Tian
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      Domain pattern is the carrier of electromechanical property. A novel domain pattern will open a gate for ferroelectric nanodevice. A distinctive topological domain pattern termed as hierarchical vortex (Hvo) has been found in polycrystalline ferroelectric based on the first-principles-based atomistic method. The Hvo pattern displays a unique structure, which is a flux-closing vortex encircle an anti-vortex or a vortex and anti-vortex pair (VA). Each Hvo structure could be regarded as a single vortex to forming a vortex–anti-vortex pair with anti-vortex or forming a vortex–vortex array with the vortex. The mechanism of HVo obtained in polycrystalline ferroelectric has been found that the grain boundary (GB) equals the domain wall when the first-order vortex is in the vortex. The HVo will open a new view of the domain topology pattern and its evolution.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-06-04T07:00:00Z
      DOI: 10.1142/S2010135X22500096
       
  • Magnetoelectric gradient structures: Properties and applications

    • Authors: A. O. Nikitin, V. A. Kiselev, V. A. Misilin, Yu. V. Kiliba, R. V. Petrov
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      This paper is devoted to a comprehensive study on a new type of microwave structures named magnetoelectric (ME) gradient structures. These structures are studied in this paper to understand the possibilities and application principles in feasible devices. The structure under study was calculated at different values of the applied electric field and different values of the relative permittivity of the artificial dielectric layer. The layered multiferroic structure in inhomogeneous electric and magnetic fields was calculated on the basis of the previously proposed mathematical model. The eigenwaves spectrum for several considered cases was the result of the performed calculation. The concept of using ME gradient structures in the design of electronically controlled microwave devices is formed on the basis of the results of a numerical experiment. Structures of this type will preferably be used in electronically controlled devices for the directional transmission of microwave signals, as it was shown in the theoretical part of the paper.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-06-02T07:00:00Z
      DOI: 10.1142/S2010135X22500084
       
  • Agreement in experimental and theoretically obtained electrocaloric effect
           in optimized Bi[math] doped PbZr[math]Ti[math]O3 material

    • Authors: Shubhpreet Kaur, Mehak Arora, Sunil Kumar, Parambir Singh Malhi, Mandeep Singh, Anupinder Singh
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      This work harmonizes the experimental and theoretical study of electrocaloric effect (ECE) in (Pb[math]Bi[math](Zr[math]Ti[math]O3 solid solution by optimizing sintering temperature. Bi[math]-doped PbZr[math]Ti[math]O3 solid solutions were synthesized by the conventional solid-state reaction method. Different samples were prepared by varying the sintering temperature. X-ray diffraction study confirms the crystalline nature of all the samples. An immense value of polarization has been acquired in the optimized sample. The maximum adiabatic temperature change of order 2.53 K with electrocaloric strength of 1.26 K mm kV[math] has been achieved experimentally. Whereas a comparatively close value of ECE has been acquired from the theoretical calculations using a phenomenological approach. Furthermore, a large value (218 mJ cm[math] of thermal energy conversion has been obtained using the Olsen cycle.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-03-09T08:00:00Z
      DOI: 10.1142/S2010135X22500035
       
  • Piezoelectric, ferroelectric and pyroelectric properties of
           (100[math]Pb(Mg[math]Nb[math]O[math]PbTiO3 ceramics

    • Authors: Chuan Chen, Yan Wang, Jiajiu Li, Chaofeng Wu, Guanrong Yang
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      A series of (100[math]Pb(Mg[math]Nb[math]O[math]PbTiO3 (PMN[math]PT, [math]= 24, 25, 26) ceramics were prepared by solid-state reaction technique using MgNb2O6 precursor. The results of the detailed characterizations reveal that the content of PT has negligible influence on the grain size, and all samples possess the perovskite structure. As the PT content increases, the samples changed from the normal ferroelectric phase to the ergodic relaxor state at room temperature. As a result, PMN–[math]PT ceramics are endowed with electro-strain of 0.08% at a relatively low electric field of 2 kV/mm, and effective piezoelectric coefficient of 320 pm/V was obtained. Simultaneously, the PMN–[math]PT ceramics have exceptional pyroelectric performance, exhibiting a high pyroelectric coefficient [math][math]5.5 – 6.3 × 10[math] C⋅cm[math]⋅K[math]. This study demonstrates the great potential of PMN–[math]PT for piezoelectric and pyroelectric device applications.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-03-04T08:00:00Z
      DOI: 10.1142/S2010135X22500023
       
  • Dielectric relaxation and conduction mechanism of NaMgPO4 compound

    • Authors: L. Miladi, A. Oueslati, M. Ben Gzaiel, M. Gargouri
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      The polycrystalline NaMgPO4 ceramic, synthesized via a high-temperature solid-state reaction route, has been characterized by using different experimental procedures. The X-ray powder diffraction confirmed the phase formation of the synthesized compound in the orthorhombic phase. It assumed an olivine-type structure made up of corners linked between tetrahedral PO4 and octahedral NaO6 and MgO6 groups. Infrared and Raman spectroscopies confirmed the presence of PO[math] groups. Local structure and chemical bonding between MgO6 octahedral and PO[math] tetrahedral groups investigated by diffusion Raman is the feature in the phase transition at [math] 693 K. The temperature dependences of the real [math] and imaginary [math] parts of dielectric permittivity show a distribution of relaxation times. From Nyquist plots, the presence of grain and grain boundary effect in the material is noticed. The impedance spectroscopy measurement showed a non-Debye-type process. From the impedance data, the determined grain resistance reduces with increment of temperature showing negative temperature coefficient of resistance (NTCR)-type nature of the material which also confirmed from conductivity analysis. The temperature dependence of [math] reveals an Arrhenius-type behavior with two activation energies, 0.98 eV in region I and 0.67 eV in region II. Studied sample’s conduction is assured by Na[math] ions’ hopping in tunnels and its mechanism was discussed.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-01-26T08:00:00Z
      DOI: 10.1142/S2010135X21500326
       
 
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