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231225s2020 xx |||||o 00| ||eng c |
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|a 10.1002/adma.201906224
|2 doi
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|a pubmed24n1015.xml
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|a (NLM)31880026
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|a DE-627
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|a eng
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1 |
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|a Wang, Jian-Jun
|e verfasserin
|4 aut
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|a Extraordinarily Large Electrocaloric Strength of Metal-Free Perovskites
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|c 2020
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|a Text
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|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Revised 30.09.2020
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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|a 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
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|a Journal Article
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|a electrocaloric effect
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|a ferroelectrics
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|a metal-free perovskites
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|a thermodynamic potential
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1 |
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|a Fortino, Daniel
|e verfasserin
|4 aut
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1 |
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|a Wang, Bo
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zhao, Xinye
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Chen, Long-Qing
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 32(2020), 7 vom: 24. Feb., Seite e1906224
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnns
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| 773 |
1 |
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|g volume:32
|g year:2020
|g number:7
|g day:24
|g month:02
|g pages:e1906224
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|u http://dx.doi.org/10.1002/adma.201906224
|3 Volltext
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