物理学报2011，Vol.60Issue(3)：683-688,6.
CaCu3Ti4O12-MgTiO3陶瓷的介电性能与I-V非线性特征
Dielectric properties and nonlinear current-voltage behavior of MgTiO3-doped CaCu3 Ti4O12 ceramics
摘要
Abstract
The CaCu3Ti4O12-xMgTiO3 (x = 0, 0.25, 0.5, 1.0) ceramics have been prepared by a solid-state reaction method.The effects of MgTiO3 doping on the phase structure, microstructure and dielectric properties of CaCu3Ti4O12 ceramics have been investigated. The results indicate that MgTiO3 doping not only reduced the dielectric loss of low frequency range and raised the breakdown voltage but also significantly improved the I-V nonlinearity coefficient. The optimized properties of MgTiO3 doped CaCu3Ti4O12 can be well explained by the uniformity of the grains, the reduction of the average grain boundary thinkness and the enhancement of the grain boundary resistance. Among the CaCu3Ti4O12-MgTiO3 specimens in this work, the CaCu3Ti4O12-0.5MgTiO3 specimen has achieved the best comprehensive properties, which include a dielectric constant (εr) of 53958, dielectric loss (tanδ) of 0.06 at 1 kHz, breakdown voltage ( Eb) of 295 V/mm and a large nonlinearity coefficient of 66.3.关键词
L-V非线性系数/巨介电常数/压敏电压Key words
current-voltage nonlinear coefficient/ giant dielectric constant/ breakdown voltage引用本文复制引用
曹蕾,刘鹏,周剑平,王亚娟,苏丽娜,刘成..CaCu3Ti4O12-MgTiO3陶瓷的介电性能与I-V非线性特征[J].物理学报,2011,60(3):683-688,6.基金项目
国家自然科学基金(批准号:50872078和50772065)资助的课题. （批准号:50872078和50772065）
