反铁电陶瓷(Pb0.94La0.04)(Zr0.55-xSn0.45Tix)O3的电学性能研究-陕西师范大学学报期刊社网站

陕西师范大学学报（自然科学版）

物理学

反铁电陶瓷(Pb0.94La0.04)(Zr0.55-xSn0.45Tix)O3的电学性能研究

张丹1，姚国光2，孟玲1，慕春红1，王波1，刘鹏1*

(1 陕西师范大学物理学与信息技术学院，陕西西安 710062； 2 西安邮电学院应用数理系，陕西西安 710121)

张丹，女，硕士研究生，研究方向为铁电与反铁电的介电性能.

摘要:

利用X射线衍射、电滞回线和弱场介电温度谱，研究了(Pb0.94La0.04)(Zr0.55-xSn0.45Tix)O3 （PLZST，0.14≤x≤0.20）陶瓷的相结构和宏观电学性能．结果表明，随着x含量的增加，材料逐渐由反铁电四方相（antiferroelectric tetragonal, AFET）转变为铁电三方相（ferroelectric rhombohedral, FER）和反铁电四方相共存．介电温谱显示，试样的介电常数（ε）在从AFET到顺电（paraelectric,PE）相变中均呈现弥散相变的特征，且随x含量的增加，ε和tan δ值的频率色散现象逐渐增强，这表明所研究的材料由正常反铁电体逐渐向弛豫型反铁电体过渡．最后从多元复杂化合物存在纳米限度组份非均匀的观点出发对其给予了解释．

关键词：

反铁电陶瓷；介电弛豫；相变弥散

收稿日期：

2007-12-08

中图分类号：

O552.6

文献标识码：

文章编号：

1672-4291(2008)03-0031-04

基金项目：

国家自然科学基金资助项目（50572059）

Doi:

Study on electrical properties of antiferroelectric ceramics(Pb0.94La0.04)(Zr0.55-x Sn0.45Tix)O3

ZHANG Dan1， YAO Guo-guang2, MENG Ling1， MU Chun-hong1, WANG Bo1, LIU Peng1*

(1 College of Physics and Information Technology，Shaanxi Normal University，Xi′an 710062，Shaanxi，China; 2 Department of Applied Mathematics and Physics, Xi′an Institute of Posts and Telecommunications, Xi′an 710121，Shaanxi, China)

Abstract:

The phases structure and electrical properties of (Pb0.94La0.04)(Zr0.55-xSn0.45Tix)O3（PLZST，0.14≤x≤0.20）were investigated through X-ray diffraction，Sawyer-Tower polarization，and dielectric spectroscopy. It was found that，as titanium content x increases，antiferroelectric tetragonal phase transforms to the coexistence of ferroelectric rhombohedral phase and antiferroelectric tetragonal phase. A diffused AFET-PE phase transition was investigated by dielectric spectroscopy. Moreover，dispersive frequency of ε and tanδ is more obvious with increasing titanium content，which indicates that normal antiferroelectrics are gradually changed into relaxation antiferroelectrics. The diffused phase transition and dielectric relaxor were explained based upon the nano-size phase separation of PLZST complex pervoskite compounds.

KeyWords:

antiferroelectric ceramics； dielectric relaxation； phase transition diffuse