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Enhanced electrocaloric effect in compositional driven potassium sodium niobate-based relaxor ferroelectrics

Published online by Cambridge University Press:  16 October 2020

Nan Zhang,
Ting Zheng,
Chunlin Zhao,
Xiaowei Wei and
Jiagang Wu
Nan Zhang
Affiliation:
Department of Materials Science, Sichuan University, Chengdu 610065, China
Ting Zheng
Affiliation:
Department of Materials Science, Sichuan University, Chengdu 610065, China
Chunlin Zhao
Affiliation:
Department of Materials Science, Sichuan University, Chengdu 610065, China
Xiaowei Wei
Affiliation:
Department of Materials Science, Sichuan University, Chengdu 610065, China
Jiagang Wu*
Affiliation:
Department of Materials Science, Sichuan University, Chengdu 610065, China
*
a)Address all correspondence to this author. e-mail: wujiagang0208@163.com
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Abstract

Lead-free ferroelectric electrocaloric ceramics that could convert electrical energy into heat are the promising candidate for environment-friendly cooling devices. For refrigeration devices, a large temperature change (ΔT) and good temperature stability are required, which are highly related to the phase structure and the applied electric field. In this work, a diffused ferroelectric–paraelectric (FP) phase transition is formed in (K, Na)NbO3 (KNN) by using appropriate composition engineering. The relaxor ferroelectrics in this work present both a large ΔT of 1.24 K and a high ΔT/ΔE of 0.19 K mm/kV. In addition, a wide temperature span exceeds 55 °C at the high electrocaloric effect (ECE) criterion (ΔT ≥ 0.5 K) could also be observed. This work not only opens a new strategy for obtaining high-performance ceramics for refrigeration devices but also extends the application area of the KNN-based lead-free ferroelectrics from sensors, actuators and energy harvesting to solid-state cooling applications.

Keywords

ferroelectricchemical substitutionphase transformation

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Type
Invited Paper
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Journal of Materials Research , First View , pp. 1 - 11
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Copyright
Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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