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

被引：5
|
作者：
Qu, Shao H. [1 ,2 ]
Mei, Ming [3 ,4 ]
Cao, Wan Q. [3 ,4 ]
Pan, Rui K. [3 ,4 ]
Qi, Ya J. [3 ,4 ]
Zhang, Lei [3 ,4 ]
Shang, Xun Z. [3 ,4 ]
机构：
[1] Hubei Univ Arts & Sci, Hubei Prov Key Lab Low Dimens Photoelect Mat & De, Xiangyang 441053, Peoples R China
[2] Hubei Univ Arts & Sci, Sch Phys & Elect Engn, Xiangyang 441053, Peoples R China
[3] Hubei Univ, Sch Mat Sci & Engn, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Wuhan 430062, Hubei, Peoples R China
[4] Hubei Univ, Sch Mat Sci & Engn, Minist Educ Green Preparat & Applicat Funct Mat, Key Lab, Wuhan 430062, Hubei, Peoples R China
来源：
FERROELECTRICS LETTERS SECTION | 2018年 / 45卷 / 4-6期
基金：
中国国家自然科学基金;
关键词：
Ferroelectrics; entropy; exothermic effect; electric field; REFRIGERATION;
D O I：
10.1080/07315171.2018.1537335
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
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(degrees) turning of dipole with a critical electric field prevails entropy change in ferroelectric phase, while 180(degrees) 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.
引用
收藏
页码：66 / 75
页数：10
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