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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Evolution of domain structure and frequency effect on
ferroelectric properties in BIT ferroelectrics
ZHENG Xue-jun(郑学军)1, 2, LU Jia(卢  佳)1, ZHOU Yi-chun(周益春)1,2,
WU Bo(吴  波)1, CHEN Yi-qiang(陈义强)1

1. Faculty of Materials, Optoelectronic and Physics, Xiangtan University, Xiangtan 411105, China;
2. Key Laboratory for Low Dimensional Materials and Application Technology, Ministry of Education,
Xiangtan University, Xiangtan 411105, China

Abstract:Based on the time-dependent Ginzburg-Landau (TDGL) equation, the temporal evolution of the domain structure and hysteresis loops of polarization versus electric field were simulated by a phase-field model for Bi4Ti3O12 (BIT) ferroelectric single crystal under an applied electric field. In the static electric energy induced by an applied alternating electric field, the effects of field frequency on the ferroelectric properties of BIT ferroelectrics were investigated. The results show that the evolution of ferroelectric domain structure is a gradual process including domain nucleation, domain wall motion, domain growth and domain combination. In the boundary regions of ferroelectric domain, the new domain nucleations occur and the old domains disappear. The coercive field increases with the field frequency, and it is in good agreement with the previous experiment.

 

Key words: ferroelectrics; phase field theory; domain; polarization; frequency

ISSN 1672-7029
CN 43-1423/U

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