Enhanced electrocaloric effect in ferroelectric poly(vinylidene-fluoride/trifluoroethylene) 55/45 mol % copolymer at ferroelectric-paraelectric transition
Enhanced electrocaloric effect in ferroelectric poly(vinylidene-fluoride/trifluoroethylene) 55/45 mol % copolymer at ferroelectric-paraelectric transition
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DOI：
10.1063/1.3569953
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发表时间：
2011-03
影响因子：
4
通讯作者：
Shengguo Lu;B. Rožič;Qiming Zhang;Z. Kutnjak;B. Neese
中科院分区：
文献类型：
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作者：
Shengguo Lu;B. Rožič;Qiming Zhang;Z. Kutnjak;B. Neese
采用量热法直接测量了55/45mol%聚偏氟乙烯/三氟乙烯铁电共聚物在宽温度范围内的电热效应。数据揭示了在铁电-顺电（FE-PE）相变处发生的大ECE，其中在120 MV/m的电场下诱导了约12 °C的绝热温度变化，这比先前在FE-PE相变以上观察到的高得多。直接测量的ECE也证实了间接方法推导出的早期结果。实验数据还表明，存在有助于在聚合物中观察到的ECE的二次效应。
The electrocaloric effect (ECE) of the ferroelectric poly(vinylidene-fluoride/trifluoroethylene) 55/45 mol % copolymer was directly measured over a broad temperature range using a specially designed calorimetry method. The data reveal a large ECE occurring at the ferroelectric-paraelectric (FE–PE) phase transition where an adiabatic temperature change ∼12 °C was induced under a field of 120 MV/m, which is much higher than that previously observed at above the FE–PE transition. The directly measured ECE also confirms the earlier results deduced from the indirect method. The experimental data also show that there are secondary effects contributing to the observed ECE in the polymer.