| Autor: |
Du, FeiHong, Song, ZhiWu, Xu, YuTao, Han, DongLin, Li, Qiang, Zheng, ShanYu, Shen, JiaHe, Qian, XiaoShi |
| Zdroj: |
SCIENCE CHINA Technological Sciences; April 2023, Vol. 66 Issue: 4 p1119-1128, 10p |
| Abstrakt: |
Electrocaloric (EC) refrigeration holds the promise to achieve next-generation refrigeration technology that can be efficiently powered by electricity. BaTiO3(BT)-based ferroelectric materials are attractive owing to their environmentally benign compositions, large polarization, and existing manufacturing method for multilayer ceramic capacitors (MLCC), which have stimulated intensive research efforts on these materials. Here, we report an enhanced electrocaloric effect (ECE) and the refrigeration capacity of multi-element B-site substituted BT-based ceramics. The compositions of the proposed Ba(HfxSnxZry)-Ti1−2x−yO3(BHSZT) ceramics were selected by fine-tuning each substituent against Titanium ions Ti4+, aiming to their respective morphotropic phase boundary (MPB). The BHSZT exhibited an ECE that is greater than that of the single-element substituted BaTiO3ceramics by at least 50%, reaching an adiabatic temperature change of above 1.7 K under 40 kV/cm. Meanwhile, the operating temperature window of the BHSZT ceramics is observed to cover the room temperature, which is a critical feature that allows the device implementation in our daily life. The multi-element substitution improved the overall ECE performances, providing a high degree of freedom for polar reorientation and hence the large polar entropy that could be utilized by the external electric field. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
Full text from SpringerLink