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Superior Electrocaloric Performance Enabled by Highly Robust Monomorphic Ferrodistortion in NaNbO3‐Based Relaxor.

Authors :
Li, Feng
Ji, Xiaoli
Wang, Xiangjian
Dai, Changshun
Wang, Xuan
Chen, Siyu
Liu, Wei
Long, Mingsheng
Shan, Lei
Qi, He
Wang, Jianli
Wang, Chunchang
Cheng, Zhenxiang
Source :
Advanced Functional Materials. Dec2024, p1. 9p. 7 Illustrations.
Publication Year :
2024

Abstract

A synergistic realization of high electrocaloric effect (ECE) and excellent temperature stability in ferroelectrics are foundation for practical applications, which is, however, a major challenge in ferroelectric cooling community thus far. In confront with this long‐standing issue, an emergent monomorphic ferrodistortion strategy in NaNbO3‐based relaxor is proposed with flexible tetragonal polar nanoregions immersing in short‐range oxygen octahedral tilt. This not only contributes to large quantities of polar entities to increase entropy change but also produces highly robust oxygen octahedral tilt to persist ferroelectricity and obstruct thermal agitations. Therefore, a high Δ<italic>T</italic> of 0.96 K and an ultrawide temperature span Δ<italic>T</italic>span of 110 K with a record‐high figure of merit of 4.74 is achieved in Ta‐doped NaNbO3‐BaTiO3 ceramics and these superior EC performances present a remarkable breakthrough in ferroelectric bulks cooling. This work thus provides an innovative way of utilizing ferrodistortive relaxor feature with polar nanoregions immersing in oxygen octahedral tilt to simultaneously boost EC value and temperature stability and thus monomorphic ferrodistortion is proposed as an effective strategy to develop high‐performance entropy‐change materials. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
1616301X
Database :
Academic Search Index
Journal :
Advanced Functional Materials
Publication Type :
Academic Journal
Accession number :
181565409
Full Text :
https://doi.org/10.1002/adfm.202418534