Article
Materials Science, Ceramics
Jinqiu Liu, Yuechan Song, Wenwen Wu, Xingang Wang, Quan Zhou, Gaoyun Niu, Peng Liu
Summary: A series of textured ceramics with different compositions were sintered in a nitrogen environment after magnetic slip casting. The textured ceramics exhibited high permittivity, low dielectric loss, and suitable temperature coefficient, which make them suitable for electronic devices and high-density energy storage. The microstructure evolution of the sintered ceramics under a magnetic field led to improved dielectric properties.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Lin Zhou, Mingjia Jiang, Yaqiong Sun, Dong Yang, Jinhua Xu, Zhanhui Peng, Di Wu, Lingling Wei, Pengfei Liang, Xiaolian Chao, Zupei Yang
Summary: In this study, various (Cu0.5W0.5)xTi1-xO2 (CWTOx) ceramics were fabricated by a traditional solid reaction method, showing a high permittivity (epsilon r>104), low dielectric loss (tan delta < 0.1), and good temperature stability within a broad frequency/temperature range for CWTO0.015 ceramic, which meets the application requirement of X8R. Abnormal dielectric relaxation phenomena at low and high temperature regions were explained by interface polarization and ionization of oxygen vacancies, respectively, and the CP performance of CWTOx ceramics was predominantly influenced by the interface barrier layer capacitance effect according to complex impedance, XPS, and EPR results. This finding is expected to promote the further development and application of CP materials.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Zichen He, Minghe Cao, Eugene Furman, Michael T. Lanagan, Hua Hao, Zhonghua Yao, Zhiyong Yu, Hanxing Liu
Summary: The dielectric properties of SrTiO3 ceramics prepared by plasma-activated sintering were investigated. The material exhibited high permittivity and low dielectric loss, with one mode being sensitive to humidity and the other mode showing abnormal slowing down of relaxation rate with increasing temperature.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Engineering, Electrical & Electronic
Ying Sun, Hongbo Liu, Fangchao Liu, Gang Liu
Summary: Research has shown that thin films of BiFeO3-BaTiO3-SrTiO3 have ultrahigh-energy storage density, but the energy storage properties of ternary bulk ceramics of BiFeO3-BaTiO3-SrTiO3 have not been studied. This study prepared BiFeO3-BaTiO3-SrTiO3 ceramics and found that Mn-doped 0.25BiFeO(3)-0.30BaTiO(3)-0.45SrTiO(3) has the most optimized electrical energy storage properties, with an energy storage density of 1.33 J/cm(3), efficiency of 88.5%, and 90% stored energy releasing in 120 ns.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Hongrui Jia, Zhigang Liang, Zhen Li, Fei Li, Linghang Wang
Summary: Ferroelectric ceramic materials with large and temperature-insensitive strain responses were fabricated in this work, showing promising potential for actuator applications in harsh environmental conditions. The phase structure of xBMZ-PZ-0.45PT ceramics evolves with increasing BMZ content, leading to evident diffuse phase transition behavior. The highest relaxation behavior was observed for x = 0.35 composition.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Materials Science, Ceramics
Yuan Zhou, Zhixuan Tian, Yanzhi Cai, Chengye Liu, Yifan Li, Xiang Li
Summary: Tm2O3 was introduced into the KNN structure for the first time in this study, and (1-x)K0.5Na0.5Nb0.7Ta0.3O3xTm(2)O(3) (x=0.1-1.0%) powders were synthesized through a solvothermal method. The corresponding ceramics were prepared via atmospheric sintering. The introduction of Tm3+ promoted the refinement of KNN grain and resulted in significant increase in room-temperature dielectric permittivity and relaxation dispersion.
CERAMICS INTERNATIONAL
(2023)
Article
Biochemistry & Molecular Biology
Nateeporn Thongyong, Narong Chanlek, Pornjuk Srepusharawoot, Prasit Thongbai
Summary: The Mg2+/Ta5+ codoped rutile TiO2 ceramic exhibited high dielectric permittivity and low loss tangent, with the properties being recoverable to the initial values through annealing. The giant dielectric properties were attributed to insulating grain boundaries and insulative surface layer effects.
Article
Chemistry, Physical
B. Sawicki, E. Tomaszewicz, T. Gron, M. Berkowski, M. Glowacki, M. Oboz, J. Kusz, S. Pawlus
Summary: Single crystal of Eu3+-doped cadmium molybdate exhibits tetragonal scheelite-type structure with randomly distributed Eu3+ ions. It shows paramagnetic behavior, n-type semiconducting behavior, and metal-insulator transition. The dipole relaxation process has different time scale and the dielectric permittivity is colossal.
JOURNAL OF MATERIOMICS
(2021)
Article
Materials Science, Ceramics
Jiangtao Fan, Tiantian Yang, Yongfan Cao, Jiyan Liang
Summary: In this study, ceramics of (Tb0.5Ta0.5)(x)Ti1-xO2 with new defect clusters were fabricated, showing large dielectric constants, and one of the samples exhibited ultralow loss at room temperature and 1 kHz. The excellent dielectric properties were attributed to defective dipoles associated with oxygen vacancies, which limited the long-range hopping of electrons and caused the electron pinning effect. Grain boundary and electrode effects also contributed to the dielectric constant.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Guoqiang He, Yanjun Liu, Yinghan He, You Wu, Jun Liang, Huanfu Zhou
Summary: This paper reports on the microwave dielectric properties of SrSm2O4 ceramics and investigates their relationship with phase composition, structure, density, microscopic morphology, and properties. The results show that the ceramics sintered at the optimum temperature have closely connected grains with clear grain boundaries and uniform grains. These ceramics exhibit the best performance in the 5G/5G+ field, indicating a promising application prospect.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Stepan S. Batsanov, Sergey M. Gavrilkin, Alexander P. Korzhenevskiy, Alexander G. Antipenko, Tatyana B. Shatalova, Andrei S. Batsanov
Summary: The dielectric permittivity of hydrated detonation nano-diamonds was measured at different frequencies, showing a giant permittivity at low frequencies and a decrease at higher frequencies. The permittivity reached a peak at a certain water content and declined with further hydration. The conductivity, on the other hand, continued to increase with water content. The density of confined water near the surface of the nano-diamonds was higher than that of other types of water. Evolved gas analysis revealed two different types of adsorbed water.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Ceramics
Hao Zu, Chuanfeng Wang, Xiaojuan He, Bingzheng Wang, Hui Liu, Hui Huang, Jian Bian, Guohua Cao
Summary: CCTO materials with giant permittivity are desired in miniaturized multilayer devices, but Ni electrode cannot be used due to the decomposition of CCTO materials during sintering. By sintering in a close alumina crucible at a relatively low temperature induced by liquid phase, the decomposition reaction can be effectively suppressed. Furthermore, reoxidation in air can restore the frequency-dependent characteristics of CCTO-BN, making it possible to develop CCTO-based devices with Ni electrode.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Abhinav Yadav, Manisha Kumari, P. M. Sarun
Summary: Lead-free polycrystalline NaNb1-xVxO3 (NV: 0.00 < x < 0.06) samples were prepared and investigated for their dielectric and electrical properties in different polymorphic phases. The study found that temperature and V-content affect both grain resistance and grain-boundary resistance.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Inorganic & Nuclear
Yong Guo, Junlang Tan, Jingchang Zhao
Summary: NaF was composited into CCTO with excess Ti to prepare NaF/CCTO composite ceramics, and its physical and chemical properties were characterized. HRTEM revealed particle deposition on CCTO surface. FESEM showed the presence of nanocrystalline structures inside the grains in NaF/CCTO composite ceramics. Dielectric spectroscopy confirmed the significant improvement of CCTO's dielectric properties by NaF and excessive Ti. The dielectric constant of NaF-0.1 sample reached 2.7 x 106 and 5.1 x 105 at 20 Hz and 1 kHz, respectively.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Longhai Yang, Wenjie Gao, Jiaxing Wang, Chunxiang He, Gaili Yue, Tao Zhang
Summary: Li-doped Bi2/3Cu3Ti4O12 ceramics were successfully prepared, and the effect of Li doping on the crystal structure and dielectric properties was investigated. Li doping improved the dielectric constant and reduced the dielectric loss in the mid-frequency range. The dielectric response at different frequencies was found to originate from different regions within the ceramics.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Ceramics
Jianguo Chen, Jinrong Cheng, Jilin Guo, Zhenxiang Cheng, Jianli Wang, Hongbo Liu, Shujun Zhang
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2020)
Article
Materials Science, Ceramics
Zhuozhuang Xie, Hongbo Liu
CERAMICS INTERNATIONAL
(2020)
Article
Materials Science, Ceramics
Hongbo Liu
CERAMICS INTERNATIONAL
(2020)
Article
Materials Science, Ceramics
Hongbo Liu, Yu Xu
JOURNAL OF THE AUSTRALIAN CERAMIC SOCIETY
(2020)
Article
Materials Science, Ceramics
Hongbo Liu
Summary: A relaxor can exhibit piezoelectricity without a DC bias field, a phenomenon known as the piezoelectric memory effect. This effect is closely related to a local polar phase transition and the softening of the lattice, as indicated by electrical and structural investigations.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Electrical & Electronic
Ying Sun, Hongbo Liu, Fangchao Liu, Gang Liu
Summary: Research has shown that thin films of BiFeO3-BaTiO3-SrTiO3 have ultrahigh-energy storage density, but the energy storage properties of ternary bulk ceramics of BiFeO3-BaTiO3-SrTiO3 have not been studied. This study prepared BiFeO3-BaTiO3-SrTiO3 ceramics and found that Mn-doped 0.25BiFeO(3)-0.30BaTiO(3)-0.45SrTiO(3) has the most optimized electrical energy storage properties, with an energy storage density of 1.33 J/cm(3), efficiency of 88.5%, and 90% stored energy releasing in 120 ns.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Wenbin Huang, Hongbo Liu
Summary: A hydrothermal-assisted cold sintering process was developed to prepare antiferroelectric NaNbO3 ceramic, with physical and electrical properties comparable to ceramics made by conventional sintering techniques, but at a lower heat treatment temperature.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Physics, Condensed Matter
Liangwen Hai, Hongbo Liu
Summary: 30BiFeO(3)-70SrTiO(3) ceramic is a novel dielectric material with high permittivity and a low-temperature coefficient of capacitance. Mn doping reduces dielectric loss, and the optimal doping concentration is 1%.
SOLID STATE COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Liangwen Hai, Hongbo Liu
Summary: This study prepared tetragonal tungsten bronze ceramics using a conventional solid-state reaction method and investigated their structural, dielectric, and ferroelectric properties. It was found that the dielectric response and polarization-electric field hysteresis loop vary significantly with the Sr/Ba ratio.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Hongbo Liu, Ying Sun
Summary: This study investigates the defects in BiFeO3 and BiFeO3-based ceramics and discusses the conduction mechanism. The results show that doping with Mn and Nb can affect the conductivity.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Physics, Applied
Hongbo Liu, Jianguo Chen
Summary: In this study, the addition of Li2CO3 was found to effectively reduce the sintering temperature of piezoelectric ceramics, allowing for the co-firing of the ceramics with Ag electrodes at low temperatures to manufacture multilayer piezoelectric actuators.
JOURNAL OF ADVANCED DIELECTRICS
(2022)
Article
Engineering, Electrical & Electronic
Huan Wang, Hongbo Liu
Summary: Using a base composition of 0.76Bi(0.5)Na(0.5)TiO(3)-0.24SiTiO(3) near the morphotropic phase boundary of Bi0.5Na0.5TiO3-SiTiO3, Bi(Mg2/3Nb1/3)O-3 was added to prepare ternary dielectric ceramics. The study found that Bi(Mg2/3Nb1/3)O-3 disrupts the long-range ferroelectric ordering, leading to a rapid decrease in remanent polarization and greatly improved electrical energy storage properties in the ternary system.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Ceramics
Liangwen Hai, Hongbo Liu
Summary: In this research, Ca2+ doped Sr0.6Ba0.4Nb2O6 ceramics were designed to adjust the A-site occupancy and their influence on the structure, phase transition, and electric properties of the ceramics were studied. It was found that with increasing x, the ceramics transitioned from pure unfilled tetragonal tungsten bronze to a multiphase of the main tetragonal tungsten bronze and a parasitic CaNb2O6. The properties of CaxSr0.6-xBa0.4Nb2O6 were mainly determined by the tetragonal tungsten bronze phase, including phase transition, dielectric permittivity, and polarization, which were closely related to the site occupancies of Sr2+ and Ba2+ at the A2 sites of the tetragonal tungsten bronze phase.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Hongbo Liu, Wenbin Huang, Tao Deng, Gang Liu
Summary: The study of Mn-doped CaZrO3-NaNbO3 solid solutions showed that Mn doping can significantly reduce leakage current, with an optimal doping concentration of 3% (mole). The solid solutions exhibit stabilized antiferroelectricity when the content of CaZrO3 is less than 6% (mole), and the antiferroelectric ordering is destroyed when the content of CaZrO3 is higher than 6% (mole), resulting in a decrease in polarization.
Article
Engineering, Electrical & Electronic
Weihao He, Hongbo Liu
Summary: A new dielectric ceramic with varying polarization-electric relation from ferroelectric to antiferroelectric and linear-like has been prepared by adding Sr(Fe0.5Nb0.5)O-3 (SFN) using a conventional solid reaction method.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
