Extraordinarily Large Electrocaloric Strength of Metal-Free Perovskites

Bibliographische Detailangaben
Veröffentlicht in:	Advanced materials (Deerfield Beach, Fla.). - 1998. - 32(2020), 7 vom: 24. Feb., Seite e1906224
1. Verfasser:	Wang, Jian-Jun (VerfasserIn)
Weitere Verfasser:	Fortino, Daniel, Wang, Bo, Zhao, Xinye, Chen, Long-Qing
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2020
Zugriff auf das übergeordnete Werk:	Advanced materials (Deerfield Beach, Fla.)
Schlagworte:	Journal Article electrocaloric effect ferroelectrics metal-free perovskites thermodynamic potential

Beschreibung
Zusammenfassung:	© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. The availability of materials with high electrocaloric (EC) strengths is critical to enabling EC refrigeration in practical applications. Although large EC entropy changes, ΔSEC , and temperature changes, ΔTEC , have been achieved in traditional thin-film ceramics and polymer ferroelectrics, they require the application of very high electric fields and thus their EC strengths ΔSEC /ΔE and ΔTEC /ΔE are too low for practical applications. Here, a fundamental thermodynamic description is developed, and extraordinarily large EC strengths of a metal-free perovskite ferroelectric [MDABCO](NH4 )I3 (MDABCO) are predicted. The predicted EC strengths: isothermal ΔSEC /ΔE and adiabatic ΔTEC /ΔE for MDABCO are 18 J m kg-1 K-1 MV-1 and 8.06 K m MV-1 , respectively, more than three times the largest reported values in BaTiO3 single crystals. These predictions strongly suggest the metal-free ferroelectric family of materials as the best candidates among existing materials for EC applications. The present work not only presents a general approach to developing thermodynamic potential energy functions for ferroelectric materials but also suggests a family of candidate materials with potentially extremely high EC performance
Beschreibung:	Date Revised 30.09.2020 published: Print-Electronic Citation Status PubMed-not-MEDLINE
ISSN:	1521-4095
DOI:	10.1002/adma.201906224