Electrocaloric effect in ferroelectric polymers

被引：44
作者：
Lu, S. G. [1 ,2 ]
Rozic, B. [3 ]
Zhang, Q. M. [1 ,2 ]
Kutnjak, Z. [3 ]
Pirc, R. [3 ]
机构：
[1] Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA
[2] Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USA
[3] Jozef Stefan Inst, Ljubljana 1000, Slovenia
来源：
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2012年 / 107卷 / 03期
关键词：
TRANSVERSE STRAIN RESPONSES; VINYLIDENE FLUORIDE; PHASE-TRANSITION; CO-POLYMER; ELECTROSTRICTION; PYROELECTRICITY; FILMS;
D O I：
10.1007/s00339-012-6830-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The electrocaloric effect (ECE) of poly (vinyledene fluoride-trifluoroethylene) (P(VDF-TrFE)) 55/45 mol% copolymers was directly measured, which confirms the results deduced from Maxwell relation. The adiabatic temperature change Delta under a given electric field peaks at the ferroelectric-paraelectric (FE-PE) transition. Away from it, ECE becomes small. Delta versus applied electric field can be described well by a modified Belov-Goryaga equation. The ECE in ferroelectric polymers, especially near FE-PE transition where larger ECE is observed, are analyzed under different boundary conditions employing phenomenological theory and constitutive equations. The secondary pyroelectricity is found to play a significant role which enhances ECE in ferroelectric polymers.
引用
收藏
页码：559 / 566
页数：8
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