Dielectric properties of low-temperature sintered Ba0.60Sr0.40TiO3 ceramics co-doped with CuO-Li2CO3
JING Hui-xia, WANG Ya-juan, ZHANG Yu, YANG Jing-na, WU Yi, LIU Cheng, LIU Peng*
(College of Physics and Information Technology, Shaanxi Normal University, Xi′an 710062, Shaanxi, China)
Abstract:
Ba0.60Sr0.40TiO3 (BST) ceramic is prepared by the conventional solid state-sintering process at low temperature. The sintering behaviors, phase components, microstructures and the dielectric properties of BST ceramics co-doped with CuO and Li2CO3 is investigated. It indicated that the combination of 0.2% CuO and 2.0% Li2CO3 additions is effective in reducing the sintering temperature of Ba0.60Sr0.40TiO3 ceramics from 1 350℃ down to 925℃ and the sample sintered at low temperature displayed excellent comprehensive dielectric properties: εr=2 725, tan δ=0.004 4 ( measured at 10 kHz and 20℃), and a tunability of 32.2% ( at 10 kHz under a dc electric field of 2 kV/mm ).
KeyWords:
low-temperature sintering; dielectric properties; phase component
