高介电常数低损耗SrTiO_3介质陶瓷

SrTiO_3 DIELECTRIC CERAMICS WITH HIGH DIELECTRIC CONSTANT AND LOW DIELECTRIC LOSS

报告了重量比为57.5% SrTiO_3-31.5% PbTiO_3-6.7% Bi_2O_3-3.3% TiO_2-0.1% MnO_2-0.5% MgO-0.3% Nb_2O_5-0.1%SiO_2介质陶瓷的制备工艺和介电性质,给出了介电常数ε和介质损耗tanδ随烧成温度T的变化规律,描述了ε和tanδ的温度特性和频率特性.介电测量表明,此种介质陶瓷是制造大电容量、低介质损耗高压陶瓷电容器的优良材料.

In the paper, the preparing process and the dielectric properties of the 57.5% SrTiO_3,31.5% PbTiO_3,6.7% Bi_2O_3,3.3% TiO_2,0.1% MnO_2,0.5% MgO,0.3% Nb_2O_5,0.1% SiO_2 dielectric ceramic are reported and the change laws of dielectric constant and loss with firing temperature, T, are given. Also, the temperature and frequency characteristics of ε and tanδ are described in detail. The dielectric measurement has shown that this SrTiO_3 dielectric ceramic is a excellent dielectric ceramic material applied to high voltage ceramic capacitors with large electric capacitance and low dielectric loss.