摘要
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.
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.
出处
《中国有色金属学会会刊：英文版》
CSCD
2007年第A01期64-68,共5页
Transactions of Nonferrous Metals Society of China
基金
Projects (10472099, 10672139) supported by the National Natural Science Foundation of China
Project (207079) supported by the Key Project of Ministry of Education of China
Project (05FJ2005) supported by the Key Project of Scientific, Technological Department of Hunan Province, China
Project (06A072) supported by the Key Project of Education Department of Hunan Province, China
关键词
铁电质
相场
域
极化频率
ferroelectrics
phase field theory
domain
polarization
frequency
