Article
Materials Science, Ceramics
Hyeon-Min Yu, Su-Hwan Go, Seok-June Chae, Yeon-Gyeong Chae, Eun-Ji Kim, Jae-Min Eum, Hyun Ryu, Sahn Nahm
Summary: A ceramic with a large dielectric constant for X8R MLCC was fabricated by sintering 0.96BT-0.04BMT + y wt.% Nb2O5 ceramics at 1275℃, forming a core-shell structure. The addition of Nb2O5 resulted in a broad shell-region phase-transition peak and a decreased Er of the core-region phase-transition peak, leading to a large Er of 2285 and good temperature stability for the sample with y = 1.25. By using 0.1 wt% BaO-CaO-SiO2 to reduce the sintering temperature, a 9-layered MLCC produced with BCS-doped 0.96BT-0.04BMT + 1.25 wt% Nb2O5 ceramic at 1200℃ showed a large capacitance of 67 nF and complied with EIA-X8R regulations.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Thomas Schulz, Andrea Knauer, Peter Schaaf, Joerg Toepfer
Summary: The study focused on optimizing alloy composition to improve high-temperature dielectric properties, and investigated the effects of excess bismuth and manganese doping on performance. The results showed that the addition of small amounts of manganese extended the low-loss temperature range, while excess bismuth limited the application temperature range.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Applied
Aleksandar Stajcic, Ivana Stajcic, Vojislav V. Mitic, Chun-An Lu, Branislav Vlahovic, Dana Vasiljevic-Radovic
Summary: This research investigates the effect of N-2 and air atmospheres on the morphological and dielectric properties of modified BTO nanoparticles. It was found that the modified BTO had high dielectric constants in both atmospheres. Morphological analysis showed a connection between particle size, pore size distribution, and porosity. Image analysis data indicated that yttrium-based organometallic salt reduced oxygen vacancy generation in the N-2 atmosphere. DC bias sensitivity measurements showed that samples with higher dielectric constants were more sensitive to voltage change.
MODERN PHYSICS LETTERS B
(2022)
Article
Materials Science, Multidisciplinary
Guoqiang Luo, Ganrong Zhang, Ying Zhang, Ang Li, Yi Sun, Rong Tu, Qiang Shen
Summary: In this study, the wide-temperature stability of BaTiO3-based ceramics is achieved by B site co-doping synergistic engineering. Element Ca is added to the ceramic to reduce the Curie temperature by optimizing the crystal structure, and subsequently, Nb is introduced to further suppress and broaden the dielectric peak by forming the core-shell structure. The doped ceramics exhibit a temperature coefficient of capacitance at 25 degrees C (TCC25 degrees C) being less than +/- 15% in the wide temperature range of -55 degrees C-180 degrees C, and an excellent energy storage density of 1.13 J cm(-3). This study provides a theoretical foundation for the design and preparation of high-performance dielectric materials.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Ceramics
Qiaoli Liu, Junwei Liu, Yongfu Lian, Meijing Wang, Weihao Wang, Dayong Lu
Summary: The tetragonality and phase-transition temperature of BaTiO3 ceramics doped with rare-earth Sm decreased with increasing doping content. Colossal dielectric constant and dielectric relaxations were observed, attributed to the inhomogeneous structure and interface-polarization effect. The multi-relaxation phenomenon depended on doping content and reflected the complex inhomogeneity of the samples, with relaxation processes closely related to the electrical resistances of the grain and activation energies dependent on the crystal structures.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Haoran Xie, Hang Luo, Zhantao Pei, Sheng Chen, Dou Zhang
Summary: By introducing core-shell structure nanoparticles into the polypropylene matrix, the discharge energy density of polypropylene film capacitors has been improved, with a high efficiency maintained.
MATERIALS TODAY ENERGY
(2022)
Article
Materials Science, Ceramics
V. A. Lukacs, G. Caruntu, O. Condurache, C. E. Ciomaga, L. P. Curecheriu, L. Padurariu, M. Ignat, M. Airimioaei, G. Stoian, A. Rotaru, L. Mitoseriu
Summary: This study presents the preparation and properties of BaTiO3 nanostructured ceramics with porosity levels close to the percolation limit. The ceramics exhibited nanosized grains and multiscale porosity, leading to unique dielectric properties and a potential for gas sensing applications. Preliminary qualitative tests with acetone vapours showed promising responses from the ceramics, indicating potential for gas sensing mechanisms at the interface.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Xuewen Jiang, Hua Hao, Yang Yang, Enhao Zhou, Shujun Zhang, Ping Wei, Minghe Cao, Zhonghua Yao, Hanxing Liu
Summary: This study confirmed that Ca ions can substitute the Ti site in BaTi1-xCaxO3-x ceramics, greatly improving the low-temperature stability of dielectric constant. By introducing Bi3+ and Zn2+, the dielectric-temperature stability can be further enhanced. The 0.85BTC4-0.15BZT ceramics showed excellent temperature coefficient of capacitance and dielectric properties, meeting higher standards in the current capacitor industry.
JOURNAL OF MATERIOMICS
(2021)
Article
Materials Science, Ceramics
Zhiyu Ma, Weijia Guo, Zhenxing Yue
Summary: TiO2 addition in BSNTA ceramics improves the dielectric constant and temperature coefficient of resonant frequency. Sintering in oxygen enhances the density, dielectric constant, and Q x f value due to the reduction in defect concentration. The research provides new insight into the impact of sintering atmosphere on the Q x f value of titanate ceramics.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Dongyu Lai, Zhonghua Yao, Wei You, Biao Gao, Qinghu Guo, Ping Lu, Amjad Ullah, Hua Hao, Minghe Cao, Hanxing Liu
Summary: Recently, NaNbO3-based ceramics with excellent energy storage performances and fast charge discharge characteristics have been studied. BaTiO3 modified 0.85NaNbO3-0.15Bi(Zn2/3Nb1/3)O3 ceramics were successfully fabricated using solid state synthesis. Compared to pure 0.85NN-0.15BZN ceramics, the modified ceramics exhibit higher discharge storage density and excellent temperature stability, broadening the scope of NaNbO3-based ceramics for energy storage applications.
JOURNAL OF MATERIOMICS
(2022)
Article
Engineering, Electrical & Electronic
Xuewei Liang, Zhangyuan Zhao, Qianying Zhu, Kangjia Hu, Shenhou Li, Yong Zhang, Ivan Baturin, Vladimir Shur
Summary: Lead-free ceramics BT-xBMS with single perovskite structure were fabricated via traditional solid-state reaction, showing a transition from tetragonal to pseudo-cubic phase with increasing addition of BMS. The ceramics exhibit relaxor-like behaviors at higher BMS content, and BT-0.12BMS ceramics show optimal energy storage performance and cycling reliability.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Xuewen Jiang, Hua Hao, Jianjun Zhou, Jiahao Lv, Zichen He, Minghe Cao, Zhonghua Yao, Hanxing Liu
Summary: In this study, a new 0.9BT-0.1BMZ dielectric ceramic was synthesized using the sol-gel method, and controlling the particle size led to an improvement in energy storage density. The enhanced grain boundary effect significantly improved the energy storage performance, as demonstrated by the comprehensive analysis of electric field distributions, breakdown paths, and impedance spectra.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
Manisha Kumari, Nitish Baraik, P. M. Sarun
Summary: The study investigates the effects of Nd doping on the microstructural, optical, and dielectric properties of BaTi0.95Sn0.05O3, showing that minor Nd doping can enhance dielectric response, reduce dielectric loss, and lead to a transition from normal ferroelectrics to relaxor-like ferroelectrics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
Qi Liu, Haipeng Feng, Tianyu Li, Guangao Liu, Yao Feng, Cong Zhou
Summary: In this study, lead-free ceramics (1-x)BaTiO3-xBi(Mg3/4W1/4)O-3 [(1-x)BT-xBMW] were prepared via solid-state reaction method. X-ray patterns showed that the ceramics had perovskite structure without a second phase, and the tetragonal phase of BT transformed into a pseudo-cubic phase with the introduction of BMW. The average grain size of the ceramics decreased from 3.75 μm to 2.54 μm with the increase of BMW content, but increased to 2.83 μm at x = 20. Modification with appropriate amount of BMW improved the relaxation behavior and energy-storage performance of BT ceramics.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Hua Jiao, Zhongyu Li, Xuerui Zhou, Kang Zhao, Yufei Tang
Summary: Hydroxyapatite (HA) was introduced into tetragonal BaTiO3 by rotary evaporation, and the optimal molar ratio of BaTiO3/HA in the composite was 3:1. Different dispersants were investigated for their effects on the product phase, morphology and properties. The BaTiO3/HA porous microspheres exhibited good ability to induce bone-like apatite formation in simulated body fluid, and showed higher d33 value than human bone.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
