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化学进展 2009, Vol. 21 Issue (0708): 1603-1610 前一篇   后一篇

• 综述与评论 •

非铁电巨介电压敏材料CCTO*

罗绍华**|武聪|田勇   

  1. (东北大学秦皇岛分校材料科学与工程系 秦皇岛 066004)
  • 收稿日期:2008-08-13 修回日期:2008-10-24 出版日期:2009-08-24 发布日期:2009-06-30
  • 通讯作者: 罗绍华 E-mail:luosh00@126.com
  • 基金资助:

    国家自然科学基金

Non-Ferroelectric Giant Dielectric and Varistor CCTO

Luo Shaohua**;  |Wu Cong;  |Tian Yong   

  1. (Department of Materials Science and Engineering, Northeastern University at Qinhuangdao Branch, Qinhuangdao 066004, China)
  • Received:2008-08-13 Revised:2008-10-24 Online:2009-08-24 Published:2009-06-30
  • Contact: Luo Shaohua E-mail:luosh00@126.com

本文主要介绍了近年来一种新型类钙钛矿型非铁电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I-V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。在讨论CaCu3Ti4O12陶瓷巨介电性和压敏特性机理尚需解决问题的同时,指出了CaCu3Ti4O12作为介电材料和压敏材料的研究方向及应用的可能性。掺杂、复合及热处理工艺等对CaCu3Ti4O12的电性能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相结合会产生更广的应用空间。

A novel perovskite-type non-ferroelectric giant dielectric and non-ohmic ceramics, CaCu3Ti4O12 is discussed. Research progress in the crystal structure, phase structure, microstructure morphology, dielectric properties in conditions and I-V property are summarized. Various theroys and different models for gaint electric are compared and discussed. The origin of nonlinear behavior is explained. Problems that need to be solved of gaint electric and non-ohmic proerties mechanism are suggested. The aspects of the future research work and applications in dielectric and varistor are proposed. At the same time, the system research of the inflence of doping, composition and heat procesing on varistor proerties needs further study on. The nano technoly further promotes a certain characteristic of CaCu3Ti4O12. The combination of thin film with demand of micro-electronic as early as possible would produce the more widely applied space.

Contents
1 The structure of CaCu3Ti4O12
2 Preparation and characterization of CaCu3Ti4O12
3 Dielectric and giant dielectric properties of CaCu3Ti4O12
3.1 Dielectric properties of CaCu3Ti4O12
3.2 Origin of giant dielectric properties of CaCu3Ti4O12
3.3 Modification of dielectric properties of CaCu3Ti4O12
4 Varistor properties of CaCu3Ti4O12
5 Conclusion

中图分类号: 

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摘要

非铁电巨介电压敏材料CCTO*