Giant Electrocaloric Effect and Ultrahigh Refrigeration Efficiency in Antiferroelectric Ceramics by Morphotropic Phase Boundary Design
Junjie Li, Jianting Li, Hong‐Hui Wu, Shiqiang Qin, Xiaopo Su, Yu Wang, Xiaojie Lou, Dong Guo, Yanjing Su, Lijie Qiao, Yang Bai
Abstract
= 0-0.08) ceramics and achieves a superior ECE performance. An unprecedented high electrocaloric strength of 1.52 K·mm/kV and an ultrahigh refrigeration efficiency (coefficient of performance = 16) are obtained in PBLZT4, in the MPB near AFE end. Moreover, a large negative ECE, with the highest strength up to -0.41 K·mm/kV, is also realized due to the electric field-induced AFE-FE transition. The coexistence of giant positive and negative ECEs at adjacent temperatures can further improve the cooling capacity (∼17%) of solid-state refrigeration in a well-designed cooling cycle. This work provides a brand new materials design strategy to achieve giant positive and negative ECEs simultaneously and a novel cooling cycle to efficiently utilize the two effects.