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

doi:10.3724/SP.J.1077.2009.00953

摘要/Abstract

摘要： 采用固相反应法制备了A位复合铁电陶瓷(1-x)Bi_0.5(Na_0.82K_0.18)_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

Abstract: A new A site complex lead-free ferroelectric ceramics of (1-x)Bi_0.5(Na_0.82K_0.18)_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 ε_r-T curves of poled and unpoled samples.

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

中图分类号:

TM282

周昌荣,刘心宇,杨桂华,江民红. A位复合铁电陶瓷Bi_0.5(Na_0.82K_0.18)_0.5TiO₃-BiCrO₃的介电弛豫[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2009.00953.

ZHOU Chang-Rong,LIU Xin-Yu,YANG Gui-Hua,JIANG Min-Hong. Dielectric Relaxor of A Site Complex Ferroelectric Ceramics of
Bi_0.5(Na_0.82K_0.18)_0.5TiO₃-BiCrO₃[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2009.00953.

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A位复合铁电陶瓷Bi_0.5(Na_0.82K_0.18)_0.5TiO₃-BiCrO₃的介电弛豫

Dielectric Relaxor of A Site Complex Ferroelectric Ceramics of
Bi_0.5(Na_0.82K_0.18)_0.5TiO₃-BiCrO₃

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