铁电材料Pb(Zr_(1-x)Ti_x)O_3的电热效应  

Magnitude of intrinsic electrocaloric effect in Pb(Zr_(1-x)Ti_x)O_3 at high electric fields

作　　者：封文江[1] 尹小荷[1] 张思[1] 孟萍萍[1] 朱影[1] 何江海[1] 王传银[2] 

机构地区：[1]沈阳师范大学物理科学与技术学院,沈阳110034 [2]沈阳师范大学实验中心,沈阳110034

出　　处：《沈阳师范大学学报（自然科学版）》2013年第2期153-157,共5页Journal of Shenyang Normal University:Natural Science Edition

基　　金：辽宁省科技厅科学技术计划项目(2010220012);辽宁省高等学校优秀人才支持计划(LJQ2011117);沈阳师范大学实验中心主任基金重点项目(SYZX1003)

摘　　要：通过Landau-Devonshire的热动力学模型,研究了PbZr1-xTixO3(x=0.5、0.6、0.7、0.8、0.9)的结构转变与电热效应。发现50MV/m的强电场可使一级结构相变转变为二级连续相变。此外,零场下当x=0.5、0.6、0.7、0.8、0.9,一级结构转变温度分别为T0=665K、691K、713K、729K、740K。在强电场作用下,一级结构转变逐渐转变为二级相变,而转变温度逐渐升高,导致最大电熵变增强,比热也随之降低。PbZr1-xTixO3(x=0.5、0.6、0.7、0.8、0.9)的最大电热温变出现居里温度以上,即出现在居里温度以上200K附近。By means of Landau-Devonshire thermodynamic formalism,the structure transition and electrocaloric effect in PbZr1-xTixO3 with x=0.5,0.6,0.7,0.8,0.9 were investigated.The strong field of 50 MV/m can make the structural transition be a continuous one.In addition,when x =0.5,0.6,0.7,0.8,0.9 at the zero field,the first order structural transition occurs at T0=665 K,691 K,713 K,729 K and 740 K,respectively.The first order structural transition comes to the second one upon the strong electric field,which leads to lower the change of specific heat.The structural transition temperature is shifted at high temperature with increasing electric field.The maximum electrocaloric effect of PbZr1-xTixO3（x=0.5,0.6,0.7,0.8,0.9） is present at about 200 K above their corresponding Curie temperatures.

关 键 词：电热效应 居里温度 电熵 比热 

分 类 号：TB321[一般工业技术—材料科学与工程]