摘要
采用X Y模型和蒙特卡罗方法对有序 无序型铁电体的自发极化行为以及相变特征进行了计算机模拟研究 ,得到了与实验报道及理论研究符合良好的结果。研究结果表明隧穿频率 (即横场强度 )对有序 无序型铁电晶体的极化和退极化过程具有显著影响 ,减小材料的隧穿频率 (即减弱材料的横场强度 )是提高这类材料的剩余极化强度、居里温度和矫顽力等指标的有效途径。
The spontaneous polarization and phase transition in order-disorder ferroelectric crystal was studied using Monte Carlo computer simulation.Our study has been developed in the framework of the X-Y model with nearest-neighbor interaction. Both the effects of transverse field and external electrical field on the polarization and depolarization were taken into consideration. From our results, it is concluded that, in agreement with previous theoretical results and experimental data, the Curie temperature, the remanent polarization and the saturation coercive force of order-disorder ferroelectric crystal decrease with the increase of the transverse field strength.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2001年第4期402-404,共3页
Journal of Functional Materials
关键词
蒙特卡罗法
计算机模拟
相变
X-Y模型
铁电晶体
Computer simulation
Magnetic fields
Monte Carlo methods
Phase transitions
Polarization
