Enhanced ferroelectricity of CaBi2Nb2O9-based high-temperature piezoceramics by pseudo-tetragonal distortion

被引：41

作者：

Liu, Gang ^{[1
]}

Wu, Chao ^{[1
]}

Chen, Yu ^{[1
]}

Liang, Dayun ^{[1
]}

Wang, Bo ^{[1
]}

Wu, Jiagang ^{[1
]}

Chen, Qiang ^{[1
]}

机构：

[1] Sichuan Univ, Dept Mat Sci, Chengdu 610064, Sichuan, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2018年 / 44卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Aurivillius type materials; XRD Rietveld refinement; Ferroelectricity; ELECTROMECHANICAL PROPERTIES; BISMUTH TITANATE; THIN-FILMS; SRBI2TA2O9; PIEZOELECTRICS;

D O I：

10.1016/j.ceramint.2017.12.019

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

(LiBi)-doped CaBi2Nb2O9 (CBN) ceramics were synthesized by the conventional solid-state sintering method. The effects of (LiBi) additives on the crystalline structure were explored by Rietveld refinements. The results showed that pseudo-tetragonal distortion was induced by (LiBi) additives when x >= 0.35. This structural distortion increased the spontaneous polarization along a-axis and decreased the quits spontaneous polarization along b-axis, which was beneficial to the polarization switching, thus promoting the ferroelectricity and decreasing the coercive field (E-C) of CBN based ceramics. The Ca-0.60(Li0.5Bi0.5)(0.40)Bi2Nb2O9 (CBNLB-40) ceramics possess the optimum ferroelectric property with 2P(r) of 10 mu C/cm(2) and a coercive field (E-C) lower than 100 kV/cm. Moreover, it exhibits a good ferroelectric fatigue-free property within 10(7) switched cycles. This work may provide a new method to promote the performance of Aurivillius ferroelectric-based non-volatile memory devices.

引用

页码：5880 / 5885

页数：6

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