新型巨介电压敏陶瓷材料钛酸铜钙研究进展  

Progress in Novel Giant Dielectric and Varistor Ceramics CCTO

作　　者：罗绍华[1] 

机构地区：[1]f东北大学秦皇岛分校材料科学与工程系,河北秦皇岛066004

出　　处：《电瓷避雷器》2008年第6期25-30,共6页Insulators and Surge Arresters

基　　金：清华大学新型陶瓷与精细工艺国家重点实验室开放课题基金（KF0710）.

摘　　要：介绍了一种新型类钙钛矿型巨介电非线性压敏陶瓷材料——CaCu3Ti4O12概述了其在晶体结构、相结构、微观形貌、多条件下介电特性和电流-电压特性等方面的研究进展。比较了CaCu3Ti4O12陶瓷的各种巨介电性理论和模型，阐述了压敏特性的起源。指出CaCu3Ti4O12的巨介电特性还有隐含的物理意义没有被发现．其极化机制、拉曼谱上出现的特征能隙和特征频率的物理意义等都是有待解决的基本问题。应通过不同的制备工艺、产生不同缺陷和孪晶以及尺寸、应力研究介电特性与温度间的关系，为合理解决CaCu3Ti4O12的反常行为提供一些实验数据。同时CaCu3Ti4O12的压敏特性的研究还不充分，掺杂、复合及热处理工艺等对其影响的系统性研究工作还需要进一步的深入。纳米化可能会导致其某项特性的进一步提升．而薄膜化尽早与微电子的需要结合会产生更广的应用空间。A novel perovskite-type non-ferroelectric giant dielectric and non-ohmic ceramics is discussed. Research progress in the crystal structure, phase structure, microstructure morphology, dielectric properties in conditions and I-V property are summarized. Various theories and different models for gaint electric are compared and discussed. The origin of nonlinear behavior is explained. The no settled basic problems that some implied physics meaning of gaint electric such as polarization mechanism, the characteristic energy gap and frequency in Raman spectrum are suggested. The research on the relation between dielectric characteristic and the temperature through different processing, several flaws and twin crystal, grain size and stress can provide some experiment datas for reasonable solving the abnormal behavior of the CaCu3Ti4O12. At the same time, the influence of doping, composition and heat processing on varistor properties needs further systematically studies on. The nano technology further promotes a certain characteristic improvement of CaCu3Ti4O12. The combination of thin film with demand of microelectronic as early as possible would produce the more widely application space.

关 键 词：CACU3TI4O12 巨介电 电流-电压非线性 压敏电阻 

分 类 号：TB34[一般工业技术—材料科学与工程]