期刊
APPLIED PHYSICS LETTERS
卷 94, 期 4, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3077189
关键词
entropy; polymer blends; pyroelectricity; relaxor ferroelectrics
资金
- Department of Energy [DE-FG02-07ER46410]
- U.S. Department of Energy (DOE) [DE-FG02-07ER46410] Funding Source: U.S. Department of Energy (DOE)
We investigate the temperature dependence of the electrocaloric effect in a relaxor ferroelectric poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) terpolymer and show that the isothermal entropy change Delta S is proportional to the square of the electric displacement D (Delta S=-1/2 beta Delta D-2) and the coefficient beta increases with temperature. This temperature dependent behavior of beta is caused by the ferroelectric relaxor nature of the polymer in which the polarization response from the nanopolar regions does not generate much entropy change. Consequently, the electrocaloric effect in the relaxor ferroelectric terpolymer is smaller than that in the normal ferroelectric copolymer.
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