Thermally stimulated depolarization current study on barium titanate single crystals

Wanghua Wu,Zhifu Liu,Zhenxing Yue,Yongxiang Li,Yan Gu

doi:10.1063/1.5025501

Abstract

Thermally stimulated depolarization current (TSDC) measurements were applied to investigate BaTiO3 single crystals with &lt;100&gt;, &lt;110&gt;, and &lt;111&gt; orientations, and annealed under different atmospheres, respectively. The TSDC peaks related to ferroelectric domain, ferroelectric–paraelectric phase transition, TiTi′−VÖ dipole relaxation and oxygen vacancy migration were observed from the TSDC spectra. The formation of oxygen vacancy clusters in BaTiO3 single crystals leads to a high dipole activation energy. The &lt;111&gt; crystalline face of BaTiO3 is more stable under external field than others.

Highlights

The barium titanate (BaTiO3) based multilayer ceramic capacitors (MLCCs) always suffer from degradation due to the oxygen vacancy migration and redistribution.[1,2,3,4,5,6] much work has been done to clarify the degradation phenomenon, the mechanism of oxygen defects formation and the performance evolution of dielectric materials under electric field are still unclear
As the behavior of oxygen defects in ceramics under electric field can be affected by various factors including ferroelectric domains, grain boundaries and other impurities, it is hard to distinguish from different effects
We investigated the BaTiO3 single crystals treated under different atmospheres using Thermally stimulated depolarization current (TSDC) analysis and found that the crystal orientation and thermal treatment conditions have remarkable effect on the defect behavior of BaTiO3

Summary

Introduction

The barium titanate (BaTiO3) based multilayer ceramic capacitors (MLCCs) always suffer from degradation due to the oxygen vacancy migration and redistribution.[1,2,3,4,5,6] much work has been done to clarify the degradation phenomenon, the mechanism of oxygen defects formation and the performance evolution of dielectric materials under electric field are still unclear. Stimulated depolarization current study on barium titanate single crystals Wanghua Wu,[1,2] Zhifu Liu,1,a Yan Gu,[1] Zhenxing Yue,[3] and Yongxiang Li1,4,a 1CAS Key Lab of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Shanghai 200050, China 2University of Chinese Academy of Sciences, Beijing 100039, China 3State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China 4School of Engineering, RMIT University, Melbourne, VIC 3001, Australia (Received 9 February 2018; accepted 25 March 2018; published online 4 April 2018)

Results

Conclusion