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Enhanced electrocaloric cooling in ferroelectric single crystals by electric field reversal

Yang-Bin Ma, Nikola Novak, Jurij Koruza, Tongqing Yang, Karsten Albe, and Bai-Xiang Xu
Phys. Rev. B 94, 100104(R) – Published 29 September 2016

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.

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  • Received 11 July 2016
  • Revised 15 September 2016

DOI:https://doi.org/10.1103/PhysRevB.94.100104

©2016 American Physical Society

Physics Subject Headings (PhySH)

Statistical Physics & ThermodynamicsCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Yang-Bin Ma1,*, Nikola Novak1, Jurij Koruza1, Tongqing Yang2, Karsten Albe1,†, and Bai-Xiang Xu1,‡

  • 1Institute of Materials Science, Technische Universität Darmstadt, 64287 Darmstadt, Germany
  • 2College of Materials Science and Engineering, Tongji University, 200092 Shanghai, China

  • *y.ma@mfm.tu-darmstadt.de
  • albe@mm.tu-darmstadt.de
  • xu@mfm.tu-darmstadt.de

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Issue

Vol. 94, Iss. 10 — 1 September 2016

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