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Enhanced electrocaloric cooling in ferroelectric single crystals by electric field reversal

Ma, Yang-Bin and Novak, Nikola and Koruza, Jurij and Yang, Tongqing and Albe, Karsten and Xu, Bai-Xiang (2016):
Enhanced electrocaloric cooling in ferroelectric single crystals by electric field reversal.
In: Physical Review B, APS Publishing, pp. 100104 (1, 94, (10), ISSN 2469-9950, [Online-Edition: http://dx.doi.org/10.1103/PhysRevB.94.100104],
[Article]

Abstract

An improved thermodynamic cycle is validated in ferroelectric single crystals, where the cooling effect of an electrocaloric refrigerant is enhanced by applying a reversed electric field. In contrast to the conventional adiabatic heating or cooling by on-off cycles of the external electric field, applying a reversed field is significantly improving the cooling efficiency, since the variation in configurational entropy is increased. By comparing results from computer simulations using Monte Carlo algorithms and experiments using direct electrocaloric measurements, we show that the electrocaloric cooling efficiency can be enhanced by more than 20% in standard ferroelectrics and also relaxor ferroelectrics, like Pb(Mg1/3/Nb2/3)0.71Ti0.29O3.

Item Type: Article
Erschienen: 2016
Creators: Ma, Yang-Bin and Novak, Nikola and Koruza, Jurij and Yang, Tongqing and Albe, Karsten and Xu, Bai-Xiang
Title: Enhanced electrocaloric cooling in ferroelectric single crystals by electric field reversal
Language: English
Abstract:

An improved thermodynamic cycle is validated in ferroelectric single crystals, where the cooling effect of an electrocaloric refrigerant is enhanced by applying a reversed electric field. In contrast to the conventional adiabatic heating or cooling by on-off cycles of the external electric field, applying a reversed field is significantly improving the cooling efficiency, since the variation in configurational entropy is increased. By comparing results from computer simulations using Monte Carlo algorithms and experiments using direct electrocaloric measurements, we show that the electrocaloric cooling efficiency can be enhanced by more than 20% in standard ferroelectrics and also relaxor ferroelectrics, like Pb(Mg1/3/Nb2/3)0.71Ti0.29O3.

Journal or Publication Title: Physical Review B
Volume: 94
Number: 10
Publisher: APS Publishing
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
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 30 Sep 2016 11:06
Official URL: http://dx.doi.org/10.1103/PhysRevB.94.100104
Identification Number: doi:10.1103/PhysRevB.94.100104
Funders: The fundings of Deutsche Forschungsgemeinschaft (DFG) SPP1599 (XU 121/1, AL 578/16, NO 1221/2), National Natural Science Foundation of China (No. 51272178), and the Innovation Program of Shanghai Municipal Education Commission (No. 14ZZ041) are gratefully, acknowledged. Competence Center of HPC Hessen is appreciated for computation time.
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