Enhanced breakdown strength and dielectric properties of Bi0.0025Nb0.0025Ti0.995O2-Bi2Ti4O11 ceramics sintered at 1130 degrees C
Enhanced breakdown strength and dielectric properties of Bi0.0025Nb0.0025Ti0.995O2-Bi2Ti4O11 ceramics sintered at 1130 degrees C
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1130 摄氏度下烧结的 Bi0.0025Nb0.0025Ti0.995O2-Bi2Ti4O11 陶瓷的击穿强度和介电性能得到增强
DOI：
10.1016/j.ceramint.2019.10.142
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发表时间：
2020
影响因子：
5.2
通讯作者：
Cui Xiu-Lei
中科院分区：
文献类型：
--
作者：
Song Yue-Chan;Wu Wen-Wen;Liu Peng;Guo Bao-Chun;Cui Xiu-Lei
采用常规烧结法制备了具有高介电常数的（1-xwt） bi0.0025 nb0.0025 ti0.9950 o2 - xwtbi2ti4o11复合陶瓷。bi2ti4o11相的加入使烧结温度从1300 ℃降至1130 ℃，晶粒尺寸从~2.6 μm降至~1.5 μm。当xwt= 0.2时，击穿强度从1 kV/cm增加到13 kV/cm，同时保持高介电常数（ε′ ~ 1100）。微观结构、I-V行为和阻抗谱研究表明，小晶粒尺寸和高电阻晶界是提高击穿强度和优异介电性能的主要原因。这些优点，加上其优异的直流偏置稳定性介电常数（0-1050 V/cm），使复合材料在金红石tio2基高压MLCC应用中具有很大的潜力。
(1-xwt)Bi0.0025Nb0.0025Ti0.995O2-xwtBi2Ti4O11composite ceramics with high permittivity were fabricated by a conventional sintering method. The sintering temperature was decreased from 1300 °C to 1130 °C, and the grain size was reduced from ~2.6 μm to ~1.5 μm by the addition of Bi2Ti4O11phase. Whenxwt= 0.2, the breakdown strength was increased from 1 kV/cm to 13 kV/cm while preserving high permittivity (ϵ' ~ 1100). Microstructure, I–V behavior, and Impedance spectroscopy studies demonstrated that the enhanced breakdown strength and excellent dielectric properties were attributed to the small grain size and the highly resistant grain boundaries. These advantages, together with its excellent DC bias stability of dielectric constant (0–1050 V/cm), give the composites a great potential in rutile TiO2-based high voltage MLCC applications.