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2009 , Vol. 24 >Issue 5: 953 - 956

DOI: https://doi.org/10.3724/SP.J.1077.2009.00953

研究论文

A位复合铁电陶瓷Bi0.5(Na0.82K0.18)0.5TiO3-BiCrO3的介电弛豫

  • 周昌荣 ,
  • 刘心宇 ,
  • 杨桂华 ,
  • 江民红
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  • （1. 桂林电子科技大学 信息材料科学与工程系, 桂林 541004; 2. 桂林工学院 电子与计算机系, 桂林 541004）

收稿日期: 2008-12-23

  修回日期: 2009-02-25

  网络出版日期: 2009-09-20

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Dielectric Relaxor of A Site Complex Ferroelectric Ceramics of
Bi0.5(Na0.82K0.18)0.5TiO3-BiCrO3

  • ZHOU Chang-Rong ,
  • LIU Xin-Yu ,
  • YANG Gui-Hua ,
  • JIANG Min-Hong
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  • (1. Department of Information Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China; 2. Department of Electron and Computer, Guilin University of Technology, Guilin 541004, China)

Received date: 2008-12-23

  Revised date: 2009-02-25

  Online published: 2009-09-20

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摘要

采用固相反应法制备了A位复合铁电陶瓷(1-x)Bi0.5(Na0.82K0.18)0.5TiO3-xBiCrO3(BNKT-BCx). 研究了该陶瓷在室温至500℃温度范围内的介电性能. 结果表明该陶瓷的介电温谱存在两个介电反常峰和一个介电损耗峰, 低温介电反常峰温度附近具有明显的介电常数频率依赖性, 但居里峰随频率增加基本不变, 与典型弛豫铁电体的特征不同. 将弛豫铁电体分为本征弛豫和非本征弛豫铁电体, 通过分析极化前和极化后陶瓷的介电温谱, 发现该体系低温介电反常峰温度附近的介电频率依赖性为空间电荷和缺陷偶极子极化引起的非本征弛豫.

关键词： 钛酸铋钠; 铁电陶瓷; 介电性能; 弛豫特性

本文引用格式

周昌荣 , 刘心宇 , 杨桂华 , 江民红 . A位复合铁电陶瓷Bi0.5(Na0.82K0.18)0.5TiO3-BiCrO3的介电弛豫[J]. 无机材料学报, 2009 , 24(5) : 953 -956 . DOI: 10.3724/SP.J.1077.2009.00953

Abstract

A new A site complex lead-free ferroelectric ceramics of (1-x)Bi0.5(Na0.82K0.18)0.5TiO3-xBiCrO3(BNKT-BCx) was prepared by a conventional solid state reaction method and dielectric properties of the system in the temperature from room temperature to 500℃ were investigated. It can be evidently seen that there are two abnormal dielectric peaks and a dielectric loss peak with increasing temperature. The dielectric constant near temperature of low abnormal peak has obvious frequency dependence, and Curie temperature shifts insignificantly with increasing frequency, which is different from the characteristics of typical relaxor ferroelectrics. It suggests that relaxor ferroelectrics can be divided into the intrinsic relaxor ferroelectrics and extrinsic relaxor ferroelectrics. The frequency dependence near the temperature of low dielectric peak is extrinsic relaxor which is created by space charges and defects dipole by using the εr-T curves of poled and unpoled samples.

Key words： sodium bismuth titanate; ferroelectric ceramics; dielectrics properties; relaxor characteristics

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