摘要
利用溶胶凝胶法制备了CaCu3Ti4O12(CCTO),相对介电常数高达123000。通过对不同温度烧结的样品断口进行能谱分析,发现晶界有明显的Cu富集,而且样品介电常数以及电导率均与晶界处Cu含量成正比。分析了Cu的偏析度对介电常数的影响及其巨介电机理。
CaCu3 Ti4 O12 （CCTO） is prepared through Sol -gel method, and its relative permittivity reaches 123000. The EDS is processed on the cross -section for the samples with different sintering temperature, the amassment of Cu on the grain boundary is discovered, the permittivity and the conductivity of the samples are both proportional to content of Cu on the grain boundary. The influence on permittivity of the Cu segregation and Giant Permittivity Mechanism are studied.
出处
《功能材料与器件学报》
CAS
CSCD
北大核心
2011年第5期436-439,共4页
Journal of Functional Materials and Devices
