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巨介电CCTO及CCTO/聚合物研究
CCTO with Giant Dielectric Constant and CCTO/Polymer Composite
具有类钙钛矿结构的钛酸铜钙CaCu3Ti4O12(CCTO)介电陶瓷材料以其巨介电特性、介电常数的温度和频率稳定性及非线性等特性在材料研究领域和实际应用中受到广泛关注。本文比较了CCTO各种巨介电理论和模型,详述了目前能够较合理地解释CCTO巨介电特性的内部阻挡层电容模型(IBLC)。综述了制备方法、制备条件及改性方法对CCTO介电性能的影响。离子掺杂是降低CCTO介电损耗常用的方法之一,掺杂效果受掺杂离子半径、离子价态等多种因素的影响。将陶瓷粉体与聚合物进行复合形成0-3型复合材料是目前制备综合性能良好的介电材料的有效方法,对CCTO/聚合物复合材料的研究进展进行了评述。最后,展望了CCTO陶瓷材料的发展前景。
Perovskite-like structure CaCu3Ti4O12 (CCTO) dielectric ceramic has been paid much attention in the field of materials science and application for its colossal dielectric constant, independence of dielectric properties on the frequency and temperature in a wide range, and nonlinear behaviors. Various theories and models which are used to explain the original of colossal dielectric constant of CCTO are compared, among which the internal barrier layer capacitance (IBLC), the most reasonable model is claimed in detail. Preparing methods, preparing conditions and various modification methods for preparing CCTO and improving the dielectric properties are discussed. Ion-doping is the most popular way to decrease the dielectric loss of CCTO. The effects of ion-doping depend on the ionic radius, ionic valence and so on. It is a promising way to prepare the 0-3 composites by using ceramic as filler and polymer as matrix. The research progress of CCTO/polymer composites is discussed here. And the prospects of CCTO is put forward.
Contents
1 Introduction
2 Origin of giant dielectric constant of CCTO
2.1 Classical model
2.2 Internal barrier layer capacitance (IBLC) model
3 Preparation of CCTO
3.1 Preparation of CCTO powder
3.2 Method for reducing sintering temperature and time of CCTO
3.3 Preparation of CCTO film
4 Improvement of the properties of CCTO
4.1 A or B site doping of CCTO
4.2 Substitution of CCTO
5 CCTO/polymer composite
5.1 CCTO/polymer composite and mixture model
5.2 Improvement of the interfacial properties of CCTO/polymer
5.3 Three-phase composite
6 Conclusion
dielectric performance
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