Electrocaloric effect of the relaxor ferroelectric poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) terpolymer
Electrocaloric effect of the relaxor ferroelectric poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) terpolymer
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DOI：
10.1063/1.3077189
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发表时间：
2009-01
影响因子：
4
通讯作者：
B. Neese;Shengguo Lu;Baojin Chu;Qiming Zhang
中科院分区：
文献类型：
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作者：
B. Neese;Shengguo Lu;Baojin Chu;Qiming Zhang
我们研究了弛豫铁电聚（偏二氟乙烯-三氟乙烯-氯氟乙烯）三元共聚物中电热效应的温度依赖性，结果表明等温熵变ΔS与电位移D的平方成正比（ΔS=−1/2βΔD2），并且系数β随着温度的增加而增加。 β 的这种温度依赖性行为是由聚合物的铁电弛豫性质引起的，其中来自纳米极性区域的极化响应不会产生太多熵变。因此，弛豫铁电三元共聚物中的电热效应小于普通铁电共聚物中的电热效应。
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 ΔS is proportional to the square of the electric displacement D (ΔS=−1/2βΔD2) and the coefficient β increases with temperature. This temperature dependent behavior of β 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.