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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  [121 journals]
  • Microstructure regulation and failure mechanism study of BaTiO3-based
           dielectrics for MLCC application

    • Authors: Yan Gu, Faqiang Zhang, Wanghua Wu, Zhifu Liu
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      Most widely used dielectrics for MLCC are based on BaTiO3 composition which inevitably shows performance degradation during the application due to the migration of oxygen vacancies ([math]). Here, the BaTiO3, (Ba[math]Ca[math])TiO3, Ba(Ti[math]Mg[math])O3, (Ba[math]Ca[math])(Ti[math]Mg[math])O3, (Ba[math]Ca[math]Dy[math])(Ti[math]Mg[math])O3 ceramics (denoted as BT, BCT, BTM, BCTM and BCDTM, respectively) were prepared by a solid-state reaction method. The core-shell structured grains ([math]200 nm) featured with 10-20 nm wide shell were observed and contributed to the relatively flat dielectric constant-temperature spectra of BTM, BCTM and BCDTM ceramics. The TSDC study found that the single/mix doping of Ca[math], especially the Mg[math], Mg[math]/Ca[math] and Mg[math]/Ca[math]/Dy[math] could limit the emergence of during the sintering and suppress its long-range migration under the electric-field. Because of this, the highly accelerated lifetimes of the ceramics were increased and the value of BCDTM is 377 times higher than that of BT ceramics. The [math] junction model was built to explain the correlation mechanism between the long-range migration of and the significantly increased leakage current of BT-based dielectrics in the late stage of HALT.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2023-01-21T08:00:00Z
      DOI: 10.1142/S2010135X23500029
  • Optimization design of autofocusing metasurface for ultrasound wave

    • Authors: Zhaoxi Li, Shenghui Yang, Mengqing Zhou, Chenxue Hou, Dongdong Chen, Chunlong Fei, Di Li, Yi Quan, Yintang Yang
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      In this paper, two optimized autofocusing metasurfaces (AFMs) with different desired focal distances are designed by using particle swarm optimization (PSO) algorithm. Based on the finite element simulation software COMSOL Multiphysics, the performance of ultrasound transducer (UT) with AFM at different design parameters in Airy distributions ([math]) and the bottom thickness ([math]) of AFM are simulated and analyzed. Based on the simulation data, the artificial neural network model is trained to describe the complex relationship between the design parameters of AFM and the performance parameters of UT. Then, the multiobjective optimization function for AFM is determined according to the desired performance parameters of UT, including focal position, lateral resolution, longitudinal resolution and absolute sound pressure. In order to obtain AFMs with the desired performance, PSO algorithm is adopted to optimize the design parameters of AFM according to the multiobjective optimization function, and two AFMs are optimized and fabricated. The experimental results well agree with the simulation and optimization results, and the optimized AFMs can achieve the desired performance. The fabricated AFM can be easily integrated with UT, which has great potential applications in wave field modulation underwater, acoustic tweezers, biomedical imaging, industrial nondestructive testing and neural regulation.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2023-01-18T08:00:00Z
      DOI: 10.1142/S2010135X23500017
  • Insulator-to-metal transition in RCoO3 (R = Pr, Nd)

    • Authors: Sujoy Saha, Sadhan Chanda, Alo Dutta, T. P. Sinha
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      We report a straightforward tool to investigate insulator-metal transition in RCoO3 ([math] = Pr, and Nd) nanoparticles prepared by a sol–gel technique. Thermogravimetric analysis (TGA) of the as-prepared gel is performed to get the lowest possible calcination temperature of RCoO3 nanoparticles. The Rietveld refinement of the powder X-ray diffraction (XRD) patterns for both samples shows that the samples crystallize in the orthorhombic (Pnma) phase at room temperature. The particle size of the sample is determined by scanning electron microscopy. Ac conductivity of the materials is analyzed in the temperature range from 303 K to 673 K and in the frequency range from 42 Hz to 1.1 MHz. The insulator-to-metal transition of PrCoO3 and NdCoO3 is analyzed by ac impedance spectroscopy. DC resistivity measurement is also done to cross check the insulator-metal transition in RCoO3 system.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2023-01-12T08:00:00Z
      DOI: 10.1142/S2010135X23500030
  • Author Index (Volume 12)

    • Abstract: Journal of Advanced Dielectrics, Volume 12, Issue 06, December 2022.

      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-01-10T08:00:00Z
      DOI: 10.1142/S2010135X22990016
      Issue No: Vol. 12, No. 06 (2022)
  • Stable self-polarization in lead-free Bi(Fe[math]Mn[math]Ti[math])O3 thick

    • Authors: Mengjia Fan, Xinyu Bu, Wenxuan Wang, Wei Sun, Xiujuan Lin, Shifeng Huang, Changhong Yang
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      The BiFeO3-based film is one of the most promising candidates for lead-free piezoelectric film devices. In this work, the 1 [math]m-thick Bi(Fe[math]Mn[math]Ti[math])O3 (BFMT) films are grown on the ITO/glass substrate using a sol-gel method combined with spin-coating and layer-by-layer annealing technique. These films display a large saturated polarization of 95 [math]C/cm2, and a remanent polarization of 70 [math]C/cm2. Especially, the films are self-poled caused by an internal bias field, giving rise to asymmetric polarization-electric field ([math]) loops with a positive shift along the [math]-axis. A stable self-polarization state is maintained during the applied electric field increasing to 1500 kV/cm and then decreasing back. The weak dependence of [math] loops on frequency (1–50 kHz) and temperature (25–125[math]C) indicate that the internal bias field can be stable within a certain frequency and temperature range. These results demonstrate that the self-polarized BFMT thick films can be integrated into devices without any poling process, with promising applications in micro-electro-mechanical systems.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-12-26T08:00:00Z
      DOI: 10.1142/S2010135X22410053
  • Preparation of elastomeric nanocomposites using nanocellulose and recycled
           alum sludge for flexible dielectric materials

    • Authors: Dongyang Sun, Bernard L. H. Saw, Amaka J. Onyianta, Bowen Wang, Callum Wilson, Dominic O’Rourke, Chan H. See, Carmen-Mihaela Popescu, Mark Dorris, Islam Shyha, Zhilun Lu
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      Flexible dielectric materials with environmental-friendly, low-cost and high-energy density characteristics are in increasing demand as the world steps into the new Industrial 4.0 era. In this work, an elastomeric nanocomposite was developed by incorporating two components: cellulose nanofibrils (CNFs) and recycled alum sludge, as the reinforcement phase and to improve the dielectric properties, in a bio-elastomer matrix. CNF and alum sludge were produced by processing waste materials that would otherwise be disposed to landfills. A biodegradable elastomer polydimethylsiloxane was used as the matrix and the nanocomposites were processed by casting the materials in Petri dishes. Nanocellulose extraction and heat treatment of alum sludge were conducted and characterized using various techniques including scanning electron microscopy (SEM), thermogravimetric analysis/derivative thermogravimetric (TGA/DTG) and X-ray diffraction (XRD) analysis. When preparing the nanocomposite samples, various amount of alum sludge was added to examine their impact on the mechanical, thermal and electrical properties. Results have shown that it could be a sustainable practice of reusing such wastes in preparing flexible, lightweight and miniature dielectric materials that can be used for energy storage applications.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-12-07T08:00:00Z
      DOI: 10.1142/S2010135X22420085
  • Fabrication plate-like BaBi4Ti4O[math] single-crystalline particles by the
           molten salt synthesis method

    • Authors: Xiaoying Feng, Bei Xu, Xiaoyu Xu, Penghui Chen, Zhuozhao Wu, Duo Teng, Jie Xu, Feng Gao
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      Plate-like single-crystalline BaBi4Ti4O[math] particles were synthesized by the molten salt synthesis (MSS) method. The effects of sintering temperature, holding time, and NaCl–KCl molten salt content on the phase structure and morphology of plate-like BaBi4-Ti4O[math] particles were investigated. The results show that plate-like BaBi4Ti4O[math] particles can be synthesized when the sintering temperature is above 800[math]C. The size of particles increases with increasing sintering temperature and molten salt content. Largely anisotropic plate-like BaBi4Ti4O[math] particles with diameter [math]10[math]m and thickness of [math]0.3 [math]m can be obtained under the optimum process parameters. The crystal structure of BaBi4Ti4O[math] was determined as A21am by TEM, which should be attributed to the Bi[math] and Ba[math] diffusing into [TiO6] octahedrons.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-12-07T08:00:00Z
      DOI: 10.1142/S2010135X22500229
  • Energy storage properties in Nd-doped AgNbTaO3 lead-free antiferroelectric
           ceramics with Nb-site vacancies

    • Authors: Zhilun Lu, Dongyang Sun, Ge Wang, Jianwei Zhao, Bin Zhang, Dawei Wang, Islam Shyha
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      It is crucial to discover lead-free materials with ultrahigh recoverable energy density ([math]) that can be employed in future pulse power capacitors. In this work, a high [math] of 4.51 J/cm3 was successfully obtained in lead-free Nd-doped AgNb[math]Ta[math]O3 antiferroelectric ceramics at an applied electric field of 290 kV/cm. It is discovered that Nd doping paired with Nb-site vacancies could stabilize the antiferroelectric phase by lowering the temperatures of the M1–M2 and M2–M3 phase transitions, which leads to higher energy storage efficiency. Furthermore, Nd and Ta co-doping will contribute to the electrical homogeneity and low electrical conductivity, resulting in large breakdown strengths. Aliovalent doping in Ag-site with Nb-site vacancies serves as a novel strategy for the construction of AgNbO3-based ceramics with excellent energy storage performance.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-12-03T08:00:00Z
      DOI: 10.1142/S2010135X22420061
  • Dielectric temperature stability and energy storage performance of
           NBT-based lead-free ceramics for Y9P capacitors

    • Authors: Hongtian Li, Shiyu Zhou, Jianwei Zhao, Tingnan Yan, Yuxiao Du, Huanfu Zhou, Yongping Pu, Dawei Wang
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      In this work, novel (1 [math])(0.75Na[math]Bi[math]TiO3)-0.25Sr(Zr[math]Sn[math]Hf[math]Ti[math]Nb[math])O3-[math]NaNbO3 (NBT-SZSHTN-[math]NN, [math] = 0.1, 0.15, 0.2, 0.25) ceramics were fabricated. The influence of co-doping of NN and high entropy perovskite oxide (SZSHTN) on the phase structure, microstructure and dielectric properties of NBT-based lead-free ceramics was investigated. Dense microstructure with a grain size of [math]5 [math]m is observed. When [math] = 0.25, a wide dielectric temperature stable range of −35.4–224.3[math]C with a low temperature coefficient of capacitance of [math] 10% is achieved, fulfilling the industry standard of Y9P specification. Furthermore, excellent energy storage performance with recoverable energy density of 2.4 J/cm3, discharge efficiency of 71%, power density of 25.495 MW/cm3 and discharge rate [math] 200 ns are simultaneously obtained, which shows great potential for high temperature capacitor applications.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-12-03T08:00:00Z
      DOI: 10.1142/S2010135X22420073
  • Large effective piezoelectric response from the spontaneously polarized
           surface layer in P(VDF-TrFE) arch films

    • Authors: Xinping Hu, Yuhong Zhu, Baojin Chu
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      In this work, we show that a [math]150 pC/N can be obtained in nonpoled poly(vinylidene fluoride trifluoroethylene) (P(VDF-TrFE)) copolymer films with an arch structure. The copolymer films, which are often thought to be homogeneous, are in fact inhomogeneous in microstructure and physical properties after film fabrication. Although a large proportion of the copolymer film is nonpolar, as expected in a nonpoled ferroelectric film, the surface regions of the film are spontaneously polarized. We propose that inhomogeneous stress in the surface regions, which is either from the constraint of the substrate or skin layer effect formed during the film fabrication, generates a flexoelectric response and orients the spontaneous polarization of the ferroelectric film. As a result of the polar surface regions, the nonpoled films exhibit a piezoelectric response. The piezoelectric response is further amplified by the special arch structure of the films, leading to the observed large effective piezoelectric response. This study not only discovers the polar surface effect in ferroelectric polymer films, but also proposes an approach to design polymer materials with a strong piezoelectric response.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-11-26T08:00:00Z
      DOI: 10.1142/S2010135X22500205
  • Influence of the prestressed layer on spherical transducer in sound
           radiation performance

    • Authors: Xiaofang Zhang, Xiujuan Lin, Rui Guo, Changhong Yang, Hui Zhao, Mingyu Zhang, Yan Wang, Xin Cheng, Shifeng Huang
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      To improve the acoustic radiation performance of the spherical transducer, a prestressed layer is formed in the transducer through fiber winding. The influence of the prestressed layer on the transducer is studied from the effects of the radial prestress ([math][math]) and acoustic impedance, respectively. First, a theoretical estimation of [math][math] is established with a thin shell approximation of the prestressed layer. Then, the acoustic impedance is measured to evaluate the efficiency of sound energy transmission within the prestressed layer. Further, the ideal effects of [math][math] on the sound radiation performances of the transducer are analyzed through finite element analysis (FEA). Finally, four spherical transducers are fabricated and tested to investigate their dependence of actual properties on the prestressed layer. The results show that with the growth of [math][math], the acoustic impedance of the prestressed layer grows, mitigating the enormous impedance mismatch between the piezoelectric ceramic and water, while increasing attenuation of the acoustic energy, resulting in a peak value of the maximum transmitting voltage response (TVR[math]) at 1.18 MPa. The maximum drive voltage increases with [math][math], leading to a steady growth of the maximum transmitting sound level (SL[math]), with a noticeable ascend of 3.9 dB at a 3.44 MPa [math][math]. This is a strong credibility that the prestressed layer could improve the sound radiation performance of the spherical transducer.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-11-24T08:00:00Z
      DOI: 10.1142/S2010135X22410041
  • Electric field-induced phase transition from the glasslike to paraelectric
           phase and dielectric spectra hardening in PMN single crystal

    • Authors: E. Koroleva, A. Molokov, S. Vakhrushev
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      One of the key points in the physics of the relaxors is their response to the applied DC field. Many studies of this topic were made, in particular on the influence of the field on the dielectric properties. However, practically, in all the cases, the measurements were performed at a fixed frequency and usually with the change in the temperature at the fixed field strength. In this paper, we report the evolution of the dielectric spectra at low frequencies (0.1 Hz [math] 1 kHz) at fixed temperature 246 K on changing the DC electric field applied in (111) from 1 kV to 7 kV. Cole-Cole function was used to describe the spectra and the field dependences of the mean relaxation time [math], the oscillation strength [math] and the width parameter [math] were determined. The obtained [math]([math]) and [math] [math]([math]) provide evidence of the field-induced transition from the nonpolar glass-like phase to the nonpolar paraelectric phase at around 1.5 kV/cm. In the paraelectric phase, very fast hardening of the spectra was observed with [math] changing from 10 s to about 10[math]s. The performed analysis demonstrated that the earlier reported positive C-V effect is completely determined by the spectra hardening, while [math][math]l does not show any change in the glass-like phase and monotonously decreases with a field increase in the paraelectric state. For complete understanding of the microscopic origin of the observed phenomena, a detailed study on the short- and long-range structures at the same condition is necessary.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-11-18T08:00:00Z
      DOI: 10.1142/S2010135X22500217
  • High energy storage properties in Ca[math]La[math]TiO3-modified
           NaNbO3-based lead-free antiferroelectric ceramics

    • Authors: Cen Liang, Changyuan Wang, Wenjun Cao, Hanyu Zhao, Feng Li, Chunchang Wang
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      In this work, (1 [math])(0.92NaNbO3–0.08BaTiO3)–[math]Ca[math]La[math]TiO3 (NNBT – [math]CLT) ceramics were successfully designed and prepared by the solid-state reaction method. Investigations on the structure, dielectric, and energy storage properties were performed. The NNBT – 0.25CLT ceramic with orthorhombic phase at room temperature was found to exhibit extremely small grain size and compacted microstructure. A large [math] of 3.1 J/cm3 and a high [math] of 91.5% under the electric field of 360 kV/cm were achieved simultaneously in the sample. In addition, the energy storage performance of the sample exhibits thermal stability over the temperature range of 25–140[math]C and the frequency range of 5–500 Hz. The charge and discharge tests reveal that the ceramic shows a large current density [math] of 965 A/cm2 and power density [math] of 154 MW/cm3. This work demonstrates that the NNBT–0.25CLT ceramic is a prospective energy storage material for potential application in the field of pulsed power devices.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-11-17T08:00:00Z
      DOI: 10.1142/S2010135X22420048
  • Ferroelectric solid solutions with perovskite- and columbite-type
           components: From structures formation to domain and hysteresis phenomena

    • Authors: M. O. Moysa, V. Yu. Topolov, K. P. Andryushin, A. V. Nagaenko, L. A. Shilkina, M. V. Il’ina, O. I. Soboleva, S. Sahoo, L. A. Reznichenko
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      The paper reports results on the complex study on ferroelectric ceramics that represent solid solutions containing components with a perovskite-type or columbite-type structure. Solid solutions of a three-component (1[math])NaNbO[math]KNbO[math]CdNb2O6 system are manufactured at [math] = 0.05–0.20 and [math] = 0.10. Domain structures in ceramic grains are studied. The consistency between experimental and calculated results is examined for coexisting phases split into non-180[math] domains (mechanical twins) in the solid solution with [math] = 0.15. A correlation between the internal structure (crystal, domain, granular, and defect) and fundamental electromechanical and polarization properties is stated for the studied three-component solid solutions.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-11-09T08:00:00Z
      DOI: 10.1142/S2010135X22500230
  • Optimization of energy storage properties in
           ferroelectric ceramics

    • Authors: Ziyue Ma, Jianye Zhu, Jianhua Wu, Yanhua Hu, Xiaojie Lou, Ningning Sun, Ye Zhao, Yong Li, Xihong Hao
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      Ferroelectric materials are considered to be the most competitive energy storage materials for applications in pulsed power electronics due to excellent charge–discharge properties. However, the low energy storage density is the primary problem limiting their practical application. In this study, (1[math])Na[math]Bi[math]TiO3–[math]Sr[math]La[math]TiO3[(1[math])NBT–[math]SLT] ferroelectric ceramics are found to exhibit excellent energy storage performances through a synergistic strategy. As the SLT concentration increases, the relaxation characteristic increases significantly and the breakdown strength increases dramatically from 150 kV/cm to 220 kV/cm. The recoverable energy storage density of the 0.55NBT–0.45SLT ceramic is 2.86 J/cm3 with an energy storage efficiency of 88% under an electric field of 220 kV/cm. Furthermore, the ceramic with [math] = 0.45 mol exhibited excellent energy storage stability in the ranges of 20–180[math]C (temperature) and 1–125 Hz (frequency). These excellent properties demonstrate the potential of (1[math])NBT–[math] SLT ceramics when used as dielectric capacitors in pulsed power systems.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-10-27T07:00:00Z
      DOI: 10.1142/S2010135X22420036
  • Achieving both large piezoelectric constant and low dielectric loss in
           BiScO3-PbTiO3–Bi(Mn[math]Sb[math])O3 high-temperature piezoelectric

    • Authors: Yunyun Feng, Changhong Yang, Xiaoying Guo, Wei Sun, Wenxuan Wang, Xiujuan Lin, Shifeng Huang
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      BiScO3–PbTiO3 binary ceramics own both high Curie temperature and prominent piezoelectric properties, while the high dielectric loss needs to be reduced substantially for practical application especially at high temperatures. In this work, a ternary perovskite system of (1–[math]–[math])BiScO3–[math]PbTiO3–[math]Bi(Mn[math]Sb[math])O3 (BS–[math]PT–[math]BMS) with [math]= 0.005, [math]= 0.630–0.645 and [math]= 0.015, [math]= 0.625–0.640 was prepared by the traditional solid-state reaction method. The phase structure, microstructure, dielectric/piezoelectric/ferroelectric properties were studied. Among BS–[math]PT–[math]BMS ceramic series, the BS–0.630PT–0.015BMS at morphotropic phase boundary possesses the reduced dielectric loss factor (tan[math] = 1.20%) and increased mechanical quality factor ([math][math] = 84), and maintains a high Curie temperature ( [math] = 410[math]C) and excellent piezoelectric properties ([math][math]= 330 pC/N) simultaneously. Of particular importance, at elevated temperature of 200[math]C, the value of tan[math] is only increased to 1.59%. All these properties indicate that the BS–0.630PT–0.015BMS ceramic has great potential for application in high-temperature piezoelectric devices.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-10-26T07:00:00Z
      DOI: 10.1142/S2010135X22500175
  • Energy storage optimization of ferroelectric ceramics during
           phase-transition process of amorphous/nanocrystalline and polycrystalline
           by using a phase-field model for dielectric breakdown

    • Authors: Suilong Huang, Jianwen Chen, Zhen Su, Xiucai Wang, Wenbo Zhu, Wenjun Chen, Xinmei Yu, Peng Xiao
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      Ferroelectric ceramics have the potential to be widely applied in the modern industry and military power systems due to their ultrafast charging/discharging speed and high energy density. Considering the structural design and electrical properties of ferroelectric capacitor, it is still a challenge to find out the optimal energy storage of ferroelectric ceramics during the phase-transition process of amorphous/nanocrystalline and polycrystalline. In this work, a finite element model suitable for the multiphase ceramic system is constructed based on the phase field breakdown theory. The nonlinear coupling relationship of multiple physical fields between multiphase ceramics was taken into account in this model. The basic structures of multiphase ceramics are generated by using the Voronoi diagram construction method. The specified structure of multiphase ceramics in the phase- transition process of amorphous/nanocrystalline and polycrystalline was further obtained through the grain boundary diffusion equation. The simulation results show that the multiphase ceramics have an optimal energy storage in the process of amorphous polycrystalline transformation, and the energy storage density reaches the maximum when the crystallinity is 13.96% and the volume fraction of grain is 2.08%. It provides a research plan and idea for revealing the correlation between microstructure and breakdown characteristics of multiphase ceramics. This simulation model realizes the nonlinear coupling of the multiphase ceramic mesoscopic structure and the phase field breakdown. It provides a reference scheme for the structural design and performance optimization of ferroelectric ceramics.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-10-21T07:00:00Z
      DOI: 10.1142/S2010135X22450011
  • Effect of Li2CO3 addition on structural and electrical properties of
           0.7BiFeO[math]0.3BaTiO3 piezoelectric ceramic

    • Authors: Hongbo Liu, Jianguo Chen
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      In this work, Li2CO3 was added into 0.7BiFeO[math]0.3BaZr[math]Ti[math]O[math]0.01molMnO2 (70BFBTMn) piezoelectric ceramics to reduce their sintering temperatures. 70BFBTMn ceramics were sintered by a conventional solid reaction method, and their structural, dielectric, piezoelectric and ferroelectric properties were studied. These results indicate that 0.5% (mole) Li2CO3 is the optimized content and it can reduce the sintering temperature by 100[math]C, making the possibility of the piezoelectric ceramics cofiring with Ag electrodes at low temperatures to manufacture multilayer piezoelectric actuators.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-10-19T07:00:00Z
      DOI: 10.1142/S2010135X2241003X
  • Superior energy storage efficiency through tailoring relaxor behavior and
           band energy gap in KNN-based ferroelectric ceramic capacitors

    • Authors: Limin Hou, Changxiao Li, Xinjian Wang, Xiaozhi Wang, Ting Wang, Yu Huan
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      With the increasing demand of high-power and pulsed power electronic devices, environmental-friendly potassium sodium niobate ((Na[math]K[math])NbO3, KNN) ceramic-based capacitors have attracted much attention in recent years owning to the boosted energy storage density ([math]). Nevertheless, the dielectric loss also increases as the external electric field increases, which will generate much dissipated energy and raise the temperature of ceramic capacitors. Thus, an effective strategy is proposed to enhance the energy storage efficiency ([math]) via tailoring relaxor behavior and bad gap energy in the ferroelectric 0.9(Na[math]K[math])-NbO3–0.1Bi(Zn[math](Nb[math]Ta[math])[math])O3 ceramics. On the one hand, the more diverse ions in the B-sites owing to introducing the Ta could further disturb the long-range ferroelectric polar order to form the short–range polar nanoregions (PNRs), resulting in the high [math]. On the other hand, the introduction of Ta ions could boost the intrinsic band energy gap and thus improve the [math]. As a result, high [math] of 3.29 J/cm3 and ultrahigh [math] of 90.1% at the high external electric field of 310 kV/cm are achieved in [math] = 0.5 sample. These results reveal that the KNN-based ceramics are promising lead-free candidate for high-power electronic devices.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-09-28T07:00:00Z
      DOI: 10.1142/S2010135X22420012
  • Enhancement of permittivity and energy storage efficiency of poly
           (vinylidene fluoride-chlorotrifluoroethylene) by uniaxial stretching

    • Authors: Zhenji Zhou, Weimin Xia, Jing Liu, Na Tian, Caiyin You
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      Dielectric polymer film capacitors with a high-power density as well as efficient charge and discharge rates have great potential for application to fulfill the miniaturized and lightweight requirements of the electronic and stationary power systems. It was reported that the elastic recovery rate and energy storage density of poly (vinylidene fluoride-chlorotrifluoroethylene) [P(VDF-CTFE)] polymer film can be enhanced through thermostatic uniaxial stretching. But it is unknown about the relationship between the stretching rate and above properties. In this study, we investigated the effect of different stretching rates on the conformation, elastic recovery, dielectric constant, and energy storage density of stretched P(VDF-CTFE) polymer films. It was found that the stretching rate significantly affected the formation of polar [math]-crystal phase, causing different dielectric properties. The degrees of elastic recovery of P(VDF-CTFE) film vary with stretching rates. Among them, the elastic recovery rate of the P(VDF-CTFE) 94/6 film is 46.5% at a stretching rate of 15 mm/min, the dielectric constant is 12.25 at 100 Hz, and the energy density reaches 3.95 J/cm3 with the energy loss of 39% at 200 MV/m field.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-08-19T07:00:00Z
      DOI: 10.1142/S2010135X22420024
  • Domain structure and dielectric diffusion-relaxation characteristics of

    • Authors: Xudong Qi, Kai Li, Lang Bian, Enwei Sun, Limei Zheng, Rui Zhang
      Abstract: Journal of Advanced Dielectrics, Ahead of Print.
      Relaxor-based ternary Pb(In[math]Nb[math])O3–Pb(Mg[math]Nb[math])O3–PbTiO3(PIN–PMN–PT) single crystals and ceramics are promising candidates for high-performance electromechanical conversion devices. It is known that the domain structure and dielectric diffusion–relaxation characteristics are crucial to the excellent performances of relaxor ferroelectrics. In this work, we prepared the PIN–PMN–PT ceramics with various PIN/PMN proportions and systematically investigated their domain structure and dielectric diffusion–relaxation properties. The effect of PIN/PMN proportion on the domain size and dielectric diffusion–relaxation characteristics was also studied. The investigations showed that PIN–PMN–PT ceramics presented multi-type domain patterns comprising irregular island domains and regular lamellar domains. Moreover, the dependent relations of PIN/PMN proportions on the dielectric diffusion and domain size indicated that the PIN composition has a stronger lattice distortion than PMN composition; increasing the PIN proportion can enhance the dielectric diffusion and decrease the domain size. Our results could deepen the understanding of structure–property relationships of multicomponent relaxor ferroelectrics and guide the design and exploration of new high-performance ferroelectric materials.
      Citation: Journal of Advanced Dielectrics
      PubDate: 2022-08-18T07:00:00Z
      DOI: 10.1142/S2010135X22410028
  • Stable large-area monodomain in as-grown bulk ferroelectric single crystal

    • 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
  • 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
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