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Research Article | Open Access

Temperature dependent conductivity of Bi4Ti3O12 ceramics induced by Sr dopants

Lin WANG, Mengqi GUI, Hai-Bo JIN, Xinyuan HU, Yongjie ZHAO, Naseer Muhammad ADNAN, Jing-Bo LI( )
Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
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Abstract

Bi4Ti3O12 is an important lead-free ferroelectric material. Doping modification of Bi4Ti3O12 has attracted great attention to improving its performances. In this work, the effect of Sr dopants on the microstructure, dielectric, and conductivity of Bi4Ti3O12 ceramic was investigated by XRD, SEM, and AC impedance spectroscopy. Substitution of 1 at% Sr for Bi decreased the grain size, suppressed the dielectric dispersion of Bi4Ti3O12 ceramic at room temperature, and resulted in different effects on the conductivity of grains and grain boundaries. The conductivity of grains in Bi4Ti3O12 ceramic was increased by the small amount of Sr dopants in the whole experimental temperature range. While the grain boundaries of 1 at% Sr-doped Bi4Ti3O12 exhibited lower conductivity than pure Bi4Ti3O12 below ~380 ℃ and higher conductivity above ~380 ℃. The experimental phenomena were interpreted in term of compensating defects for Sr dopants.

Keywords

dielectricimpedance analysiselectrical propertiesdefectsAurivillius compound

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Journal of Advanced Ceramics
Volume 7 Issue 3,
September 2018
Pages 256-265
DOI: 10.1007/s40145-018-0277-1
Cite this article:
WANG L, GUI M, JIN H-B, et al. Temperature dependent conductivity of Bi4Ti3O12 ceramics induced by Sr dopants. Journal of Advanced Ceramics, 2018, 7(3): 256-265. https://doi.org/10.1007/s40145-018-0277-1

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Received: 06 December 2017
Revised: 07 March 2018
Accepted: 21 April 2018
Published: 10 October 2018
© The author(s) 2018

Open Access The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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