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Journal of Inorganic Materials

Journal of Inorganic Materials >

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

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

Research Paper

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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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

Cite this article

ZHOU Chang-Rong , LIU Xin-Yu , YANG Gui-Hua , JIANG Min-Hong . Dielectric Relaxor of A Site Complex Ferroelectric Ceramics of
Bi0.5(Na0.82K0.18)0.5TiO3-BiCrO3[J]. Journal of Inorganic Materials, 2009 , 24(5) : 953 -956 . DOI: 10.3724/SP.J.1077.2009.00953

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