| Autor: |
Li, Junjie, Li, Jianting, Wu, Hong-Hui, Qin, Shiqiang, Su, Xiaopo, Wang, Yu, Lou, Xiaojie, Guo, Dong, Su, Yanjing, Qiao, Lijie, Bai, Yang |
| Zdroj: |
ACS Applied Materials & Interfaces; October 2020, Vol. 12 Issue: 40 p45005-45014, 10p |
| Abstrakt: |
Electrocaloric effect (ECE) in ferroelectric (FE)/antiferroelectric (AFE) materials offers a promising high-efficient and zero-emission solid-state cooling technology, whose materials design is usually focused on the morphotropic phase boundary (MPB) between two FE phases. This work constructs an MPB between an orthorhombic AFE and a rhombohedral FE phase in Pb0.97–xBaxLa0.02Zr0.95Ti0.05O3(PBLZT100x, x= 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. |
| Databáze: |
Supplemental Index |
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