Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/6242
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Title: The electrocaloric effect around the orthorhombic- tetragonal first-order phase transition in BaTiO₃
Authors: Bai, Y
Ding, K
Zheng, G 
Shi, SQ 
Cao, JL
Qiao, L
Issue Date: Jun-2012
Source: AIP advances, June 2012, v.5 no. 2, 022162 , p.1-5
Abstract: This paper demonstrates the electrocaloric effect (ECE) around BaTiO₃'s orthorhombic-tetragonal first-order phase transition. By manipulating a field-induced transition of a metastable phase in the thermal hysteresis zone, a huge exothermic or endothermic peak appears after first applying or removing electric fields because of the energy change of lattice structure. A large ECE of ΔT/E = 1.4K·m/MV, equaling to latent heat, is achieved under 10kV/cm at 10°C. The entropy change for polarization ordering alone induces an ECE two orders of magnitude lower under the same condition. It confirms the dominant factor to ECE of the energy flow due to the structural phase transition.
Keywords: Barium compounds
Dielectric hysteresis
Dielectric polarisation
Entropy
Ferroelectric materials
Ferroelectric transitions
Latent heat
Pyroelectricity
Publisher: American Institute of Physics
Journal: AIP advances 
ISSN: 2158-3226 (online)
DOI: 10.1063/1.4732146
Rights: © 2012 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Y. Bai et al., AIP Advances 2, 022162 (2012) and may be found at http://link.aip.org/link/?adv/2/022162
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