Microstructure and dielectric characteristics of Nb2O5 doped BaTiO3-Bi(Zn1/2Ti1/2)O-3 ceramics for capacitor applications
Microstructure and dielectric characteristics of Nb2O5 doped BaTiO3-Bi(Zn1/2Ti1/2)O-3 ceramics for capacitor applications
复制标题
电容器用 Nb2O5 掺杂 BaTiO3-Bi(Zn1/2Ti1/2)O-3 陶瓷的微观结构和介电特性
DOI：
10.1016/j.jeurceramsoc.2016.08.003
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发表时间：
2017
影响因子：
5.7
通讯作者：
Cao Minghe
中科院分区：
文献类型：
--
作者：
Lu Yangyang;Hao Hua;Zhang Shujun;Liu Hanxing;Su Cong;Yao Zhonghua;Cao Minghe
研究了Nb_2 O_5添加量对0.8BaTiO_3 -0.2Bi（Zn_（1/2）Ti_2/2）O_3（0.8BT-0.2BZT）陶瓷介电性能和相形成的影响。在Nb 2 O 5掺杂水平为0.5wt.%的范围内实现了所需的钙钛矿相。-3.0重量%。掺杂1.5wt.%的0.8BT-0.2BZT陶瓷Nb 2 O 5在室温和1 kHz频率下具有中等介电常数（ε = 1170）和低介电损耗（tanδ= 1%），在−55 °C-200 °C温度范围内表现出平坦的介电行为。基于该组成，在1060 °C下烧结具有Ag0.7-Pd0.3电极的X9 R-MLCC（多层陶瓷电容器）。MLCC的优化电容为26.5 nF，介电损耗tanδ为0.9%，室温电阻为4.50 × 1011Ω，时间常数高达11，900 s，在200 °C时降至175 s，比商用X7 R MLCC高一个数量级。此外，发现等效串联电阻（ESR）在2 MHz时约为0.2 mΩ，远低于汽车逆变器的DC母线电容器组的等效串联电阻（ESR）（其中期望特性为<3 mΩ）。所有这些特性的新开发的MLCC将有利于高温和大功率电容器的应用。
The effects of Nb2O5addition on the dielectric properties and phase formation of 0.8BaTiO3-0.2Bi(Znl/2Til/2)O3(0.8BT-0.2BZT) ceramics were investigated. The desired perovskite phase was achieved with Nb2O5doping levels being in the range of 0.5 wt.%–3.0 wt.%. The 0.8BT-0.2BZT ceramics doped with 1.5 wt.% Nb2O5was found to possess a moderate dielectric constant (ε = 1170) and low dielectric loss (tanδ= 1%) at room temperature and 1 kHz frequency, showing a flat dielectric behavior over the temperature range of −55 °C–200 °C. Based on this composition, the X9R-MLCC (multilayer ceramic capacitor) with Ag0.7-Pd0.3 electrode was sintered at 1060 °C. The optimized capacitance of the MLCC is 26.5 nF, with dielectric loss tanδ of 0.9% and electrical resistance of 4.50 × 1011Ω at room temperature, leading to a high time constant of 11,900 s, decreasing to 175 s at 200 °C, being one order higher than those of commercial X7R MLCC. In addition, the equivalent series resistance (ESR) was found to be on the order of 0.2 mΩ at 2 MHz, much lower than that of the DC Bus Capacitor Bank for the automotive inverters (where the desired characteristic is <3 mΩ). All these characteristics of the newly developed MLCC will benefit the high temperature and high power capacitor applications.