液相法制备CCTO及其巨介电机理的研究

The Preparation of CCTO through Liquid Phase Method and The Study of Its Giant Permittivity Mechanism

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。

Abstract: CaCu₃Ti₄O₁₂（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.