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无机材料学报

无机材料学报

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Na1/2Bi1/2TiO3-BaTiO3系陶瓷压电性及弛豫相变研究

初宝进; 李国荣; 江向平; 陈大任   

  1. 中国科学院上海硅酸盐研究所无机功能材料开放实验室, 上海 200050
  • 收稿日期:1999-10-22 修回日期:1999-11-17 出版日期:2000-10-20 网络出版日期:2000-10-20

Piezoelectric Property and Relaxation Phase Transition of Na1/2Bi1/2TiO3-BaTiO3 System

CHU Ban-Jin; LI Guo-Rong; JIANG Xiang-Ping; CHEN Da-Ren   

  1. Laboratory of Functional Inorganic Materials; Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:1999-10-22 Revised:1999-11-17 Published:2000-10-20 Online:2000-10-20

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摘要： 系统研究了（１－ｘ）Ｎａ１／２Ｂｉ１／２ＴｉＯ３－ｘＢａＴｉＯ３（ｘ＝０．０２、０．０４、０．０６、０．０８、０．１０）无铅压电陶瓷系统的相界、材料压电性能，弛豫特性及相变．这个系统的陶瓷材料具有Ｋｔ／Ｋｐ较大，频率常数比较高等特点．Ｘ－ｒａｙ衍射结构分析发现此系统的相界在０．０４＜ｘ＜０．０６之间；材料的一些主要性能在相界附近达到极值．利用介电系数－温度曲线，并结合热激电流曲线对此系统的弛豫性进行研究和分析；初步研究了各配方组成的铁电－顺电的相变过程，发现在一定的组成范围内，材料在由铁电相向顺电相的转变过程中经历了一个过渡相区．

关键词: （1-x）Na1/2Bi1/2TiO3-xBaTiO3, 无铅压电陶瓷, 准同型相界, 弛豫性相交, 过渡相区

Abstract: For (1-x)Na1/2Bi1/2TiO3xBaTiO3(x=0.02, 0.04, 0.06, 0.08, 0.10) lead-free ceramic system the morphotropic boundary, piezoelectric property, relaxation
property and phase transition were investigated. The piezoelectric ceramics of this system possess large ratios of Kt/Kp and high frequency constants.
According to XRD patterns, the morphotropic boundary lies in the composition range of 0.04<x<0.06. The main physical properties of this system can reach
extreme values near the morphotropic boundary. The relaxation property of this system was studied by using dielectric constant-temperature curves and
thermally stimulated depolarization current (TSDC) curves. Phase transition from ferroelectric to paraelectric phase was also primarily discussed and
it was found out that the ceramics within a composition range possess transitional phase region between ferroelectric phase and paraelectric phase.

Key words: (1-x)Na1/2Bi1/2TiO3-xBaTiO3, lead-free piezoelectric ceramics, morphotropic boundary, relaxation phase transition, transitional phase region

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