Volume 125, Number 5, March 2019
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||11 April 2019|
Tuning the electrocaloric reversibility in ferroelectric copolymers by a blend approach
1 College of Materials Science and Engineering, Sichuan University - Chengdu 610064, China
2 Department of Materials Science and Engineering, The Pennsylvania State University University Park, PA 16802, USA
3 School of Optical and Electronic Information, Huazhong University of Science and Technology Wuhan, Hubei 430074, China
Received: 21 November 2018
Accepted: 26 February 2019
In electrocaloric active polymers, the ferroelectric copolymer P(VDF-TrFE) 65/35 mol% exhibits the largest caloric performance (, at an electric field of 100 MV m−1 and 85 °C) due to a sharp first-order phase transition. However, this high property occurs only at the first cycle and then drops significantly in the following electrical cycle, which significantly limits the promising applications of these copolymers. Here we use a blend approach to solve the irreversibility issue. We show that the incorporation of a terpolymer into a copolymer results in the evolution from normal ferroelectric to relaxor, which is accompanied by a large reduction in the thermal hysteresis. As a result, we find that complete reversibility of electrocaloric cycles in blends can be achieved for the copolymer/terpolymer volume ratio as 3/7.
PACS: 77.70.+a – Pyroelectric and electrocaloric effects / 85.50.-n – Dielectric, ferroelectric, and piezoelectric devices / 84.32.Tt – Capacitors
© EPLA, 2019
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