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On the origin of the inverse electrocaloric effect

Grünebohm, Anna and Ma, Yang-Bin and Marathe, Madhura and Xu, Bai-Xiang and Albe, Karsten and Kalcher, Constanze and Meyer, Kai-Christian and Shvartsman, Vladimir V. and Lupascu, Doru C. and Ederer, Claude (2018):
On the origin of the inverse electrocaloric effect.
In: Energy Technology, WILEY-VCH Verlag, pp. 1491-1511, 6, (8), ISSN 2194-4296,
DOI: 10.1002/ente.201800166,
[Article]

Abstract

The occurrence of the inverse (or negative) electrocaloric effect, where the isothermal application of an electric field leads to an increase in entropy and the removal of the field decreases the entropy of the system under consideration, is discussed and analyzed. Inverse electrocaloric effects have been reported to occur in several cases, for example, at transitions between ferroelectric phases with different polarization directions, in materials with certain polar defect configurations, and in antiferroelectrics. This counterintuitive relationship between entropy and applied field is intriguing and thus of general scientific interest. The combined application of normal and inverse effects has also been suggested as a means to achieve larger temperature differences between hot and cold reservoirs in future cooling devices. A good general understanding and the possibility to engineer inverse caloric effects in terms of temperature spans, required fields, and operating temperatures are thus of fundamental as well as technological importance. Here, the known cases of inverse electrocaloric effects are reviewed, their physical origins are discussed, and the different cases are compared to identify common aspects as well as potential differences. In all cases the inverse electrocaloric effect is related to the presence of competing phases or states that are close in energy and can easily be transformed with the applied field.

Item Type: Article
Erschienen: 2018
Creators: Grünebohm, Anna and Ma, Yang-Bin and Marathe, Madhura and Xu, Bai-Xiang and Albe, Karsten and Kalcher, Constanze and Meyer, Kai-Christian and Shvartsman, Vladimir V. and Lupascu, Doru C. and Ederer, Claude
Title: On the origin of the inverse electrocaloric effect
Language: English
Abstract:

The occurrence of the inverse (or negative) electrocaloric effect, where the isothermal application of an electric field leads to an increase in entropy and the removal of the field decreases the entropy of the system under consideration, is discussed and analyzed. Inverse electrocaloric effects have been reported to occur in several cases, for example, at transitions between ferroelectric phases with different polarization directions, in materials with certain polar defect configurations, and in antiferroelectrics. This counterintuitive relationship between entropy and applied field is intriguing and thus of general scientific interest. The combined application of normal and inverse effects has also been suggested as a means to achieve larger temperature differences between hot and cold reservoirs in future cooling devices. A good general understanding and the possibility to engineer inverse caloric effects in terms of temperature spans, required fields, and operating temperatures are thus of fundamental as well as technological importance. Here, the known cases of inverse electrocaloric effects are reviewed, their physical origins are discussed, and the different cases are compared to identify common aspects as well as potential differences. In all cases the inverse electrocaloric effect is related to the presence of competing phases or states that are close in energy and can easily be transformed with the applied field.

Journal or Publication Title: Energy Technology
Volume: 6
Number: 8
Publisher: WILEY-VCH Verlag
Uncontrolled Keywords: antiferroelectrics, defect engineering, disorderm ferroelectrics, electrocaloric effects
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Mechanics of functional Materials
11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
Date Deposited: 22 May 2018 06:10
DOI: 10.1002/ente.201800166
Funders: Financial support has been guaranteed by the Deutsche Forschungsgemeinschaft via the SPP 1599 (projects: GR 4792/1‐2, XU 121/1‐2, AL 578/16‐2, LU 729/15,, Swiss National Science Foundation under project code 200021E‐162297
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