Giant electrocaloric effect in high-polar-entropy perovskite oxides

• 成果类型: Article
• 署名作者: Du, Feihong; Yang, Tiannan; Hao, Hua; Li, Shangshu; Xu, Chenhang; Yao, Tian; Song, Zhiwu; Shen, Jiahe; Bai, Chenyun; Luo, Ruhong; Han, Donglin; Li, Qiang; Zheng, Shanyu; Zhang, Yingjing; Lin, Yezhan; Ma, Zhenhua; Chen, Haotian; Guo, Chenyu; Feng, Jiawang; Zhong, Shengyi; Mai, Ruilin; Hou, Guodong; Qiu, Haixin; Xie, Meng; Chen, Xin; Yuan, Yakun; Qian, Dong; Xiang, Dao; Chen, Xuefeng; Fu, Zhengqian; Wang, Genshui; Liu, Hanxing; Chen, Jiangping; Meng, Guang; Zhu, Xiangyang; Chen, Long-Qing; Zhang, Shujun; Qian, Xiaoshi
• 署名单位: Shanghai Jiao Tong University; Shanghai Jiao Tong University; Wuhan University of Technology; Advanced Energy Science & Technology Guangdong Laboratory; Foshan Xianhu Laboratory; Shanghai Jiao Tong University; Shanghai Jiao Tong University; Shanghai Jiao Tong University; Chinese Academy of Sciences; Shanghai Institute of Ceramics, CAS; Shanghai Jiao Tong University; Shanghai Jiao Tong University; Shanghai Jiao Tong University; Shanghai Jiao Tong University; Pennsylvania Commonwealth System of Higher Education (PCSHE); Pennsylvania State University; Pennsylvania State University - University Park; University of Wollongong
• 刊物名称: Nature
• ISSN/ISSBN: 0028-1271
• DOI: 10.1038/s41586-025-08768-8
• 发表日期: 2025-04-24
• 关键词: energy-storage properties; temperature span; ceramics; performance; strength; film

摘要

Materials with a high electrocaloric effect (ECE)1,2 tend to favour a disordered yet easily tunable polar structure. Perovskite ferroelectrics3 stand out as ideal candidates owing to their high dielectric responses and reasonable thermal conductivity. The introduction of multielement atomic distortions induces a high-polar-entropy state4 that notably increases the ECE by effectively overcoming the constraints imposed by highly ordered, polar-correlated perovskite structures. Here we developed a lead-free relaxor ferroelectric with strong polar disorder through targeted multielement substitution at both the A and B sites of the perovskite, effectively distorting the lattice structure and inducing a variety of nanoscale polar configurations, polymorphic polar variants and non-polar regions. A combination of these multielement-induced features led to an increased density of interfaces, significantly enhancing the polar entropy. Remarkably, a high ECE for an entropy change of about 15 J kg-1 K-1 under a 10 MV m-1 field is observed for the material across a broad temperature range exceeding 60 degrees C. The formation of ultrafine, dispersed, multiphase lattice configurations leads to high-polar-entropy ferroelectric oxides with a high ECE and a long lifetime of over 1 million cycles that are suitable for manufacturing multilayer ceramic capacitors for practical electrocaloric refrigeration applications.