电热效应
铁电性
热电性
材料科学
等温过程
电介质
凝聚态物理
热力学
聚合物
铁电聚合物
绝热过程
偶极子
光电子学
复合材料
化学
物理
有机化学
作者
Bret Neese,Baojin Chu,Sheng-Guo Lu,Yong Wang,Eugene Furman,Qiming Zhang
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2008-08-07
卷期号:321 (5890): 821-823
被引量:1073
标识
DOI:10.1126/science.1159655
摘要
Applying an electrical field to a polar polymer may induce a large change in the dipolar ordering, and if the associated entropy changes are large, they can be explored in cooling applications. With the use of the Maxwell relation between the pyroelectric coefficient and the electrocaloric effect (ECE), it was determined that a large ECE can be realized in the ferroelectric poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] copolymer at temperatures above the ferroelectric-paraelectric transition (above 70°C), where an isothermal entropy change of more than 55 joules per kilogram per kelvin degree and adiabatic temperature change of more than 12°C were observed. We further showed that a similar level of ECE near room temperature can be achieved by working with the relaxor ferroelectric polymer of P(VDF-TrFE-chlorofluoroethylene).
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