摘要
采用传统的固相反应法制备了Cu欠量的CaCu3Ti4O12(CaCu2.7Ti4O12)陶瓷,研究了不同烧结时间对CaCu2.7Ti4O12相结构、显微形貌、介电性能和J-E非线性特征的影响。结果表明,延长保温时间降低了CaCu2.7-Ti4O12陶瓷的中低频介电损耗和击穿场强并且显著提高了其介电常数。采用肖特基热电子发射模型对其非线性特征和电学性能的变化机理进行了分析,认为耗尽层宽度是影响电学性能的主要因素。保温30h的CaCu2.7Ti4O12陶瓷有望作为低压压敏电阻应用于半导体电路中。
Cu-deficient CaCu3 Ti40lz （CaCuz. 7 Ti4 O12 ） ceramics were prepared by a traditional solid-state reac- tion method. The influence of holding time on the phase structure, microstructure, dielectric and J-E nonlinear charac- teristics was investigated. The results indicate that prolonging the holding time can decrease the dielectric loss of low- and medium-frequency and enhances greatly dielectric constant of CaCu2. z Ti4O12 ceramics, as well as reduces the breakdown voltage and the nonlinearity coefficient, which can be applied in semiconductor circuits as varistors. The characteristic of J-E nonlinear and change of electrical properties were explained by Schottky thermion launch model. It is considered that the width of depletion layer plays an important role in electrical properties. The CaCu2. 7 Ti4 O12 ceramics with holding time for 30 h is expected to apply in semiconductor circuit as a low voltage varistor.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2013年第14期96-99,107,共5页
Materials Reports
基金
国家自然科学基金(51002036)
广西自然基金(C013002
BA053007)
广西科学研究与技术开发计划资助(桂科攻12118017-13)
大学生"挑战杯"和广西大学生创新创业训练计划
