温度梯度铁电材料极化偏移与热释电性的内在关联性研究

Research on the Intrinsic Correlation Between the Polarization Offset and Pyroelectric Properties of Temperature-Gradient Ferroelectric Materials

在平均场近似的理论框架下,采用拓展的横场伊辛模型理论,探讨温度梯度铁电材料极化偏移与热释电性质的内在联系的微观物理机制。研究表明:极化偏移的极值和材料内首发相变的梯度层的性质密切相关。极化偏移的极值和热释电系数的峰值总是成对出现,改变温度梯度铁电材料内首发相变层的性质是调控极化偏移、改善材料热释电性能的关键因素。

In the theoretical framework of mean field approximation,the extended theory of the transverse ising model is adopted to explore the microscopic physical mechanism of the intrinsic correlation between the polarization offset and pyroelectric properties of temperature-gradient ferroelectric materials.Research results show that the extreme value of polarization offset is closely related to the properties of the initial phase-transition gradient layer in materials.The extreme value of polarization offset and the peak value of pyroelectric coefficient always appear in pairs,and altering the properties of the initial phase-transition layer in temperature-gradient ferroelectric materials is a key factor in regulating polarization offset and improving the pyroelectric performance of materials.