二阶相变铁电体中熵变的放热效应

IF 1.3 4区物理与天体物理 Q4 PHYSICS, CONDENSED MATTER

Ferroelectrics Letters Section Pub Date : 2018-11-02 DOI:10.1080/07315171.2018.1537335

S. Qu, Ming Mei, W. Cao, R. K. Pan, Y. Qi, Lei Zhang, Xunzhong Shang

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引用次数: 3

摘要

用统计方法模拟了T-C二阶相变铁电体中偶极子取向熵变对E的放热效应。推导了熵变和温度变化的公式，表明随着E的增大，熵在温度越高时急剧下降，放热峰随着E的增大而向高温移动，铁电相的熵变以偶极子在临界电场作用下的180°转向为主，而准电相的熵变以180°转向为主。数值模拟的结果可以解释铁电体热效应的规律。从原理上讲，相变边界具有巨大的放热效应。

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Exothermic effect of entropy change in second-order phase transition ferroelectrics

Abstract Exothermic effect of entropy change by dipole orintation upon E in T-C second order phase transition ferroelectrics is modeled with statistic method. Formula of entropy change and temperature change were derived, showing sharp drop of entropy in higher temperature for higher E, exothermic peak shifts to high temperature with E, and 180° turning of dipole with a critical electric field prevails entropy change in ferroelectric phase, while 180° turning dominates entropy change in paraelectric phase. The results of numerical simulation can explain regulation of heating effect of the ferroelectrics. Morphotropic phase boundary will possess giant exothermic effect in principle.

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来源期刊

Ferroelectrics Letters Section 物理-物理：凝聚态物理

CiteScore

1.10

自引率

0.00%

发文量

审稿时长

4.8 months

期刊介绍： Ferroelectrics Letters is a separately published section of the international journal Ferroelectrics. Both sections publish theoretical, experimental and applied papers on ferroelectrics and related materials, including ferroelastics, ferroelectric ferromagnetics, electrooptics, piezoelectrics, pyroelectrics, nonlinear dielectrics, polymers and liquid crystals. Ferroelectrics Letters permits the rapid publication of important, quality, short original papers on the theory, synthesis, properties and applications of ferroelectrics and related materials.