Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/12295
Title: Ferroelectric-to-ferroelectric phase transition induced electro-caloric energy conversion in barium titanate at room temperature
Authors: Ding, K
Zheng, GP 
Shen, Y
Keywords: Calorimetry
Electro-caloric effect
Energy conversion
Lead-free ferroelectrics
Issue Date: 2012
Publisher: Scientific.Net
Source: Key engineering materials, 2012, v. 519, p. 10-13 How to cite?
Journal: Key engineering materials 
Abstract: The electro-caloric (EC) energy conversions in single-crystal and polycrystalline barium titanate samples are investigated using differential scanning calorimetry (DSC). The DSC measurement reveals a refrigeration effect of 0.1 J/g under an electric field of 15 kV/cm at T=17.5 °C, which is related with the ferroelectric-to-ferroelectric transition in barium titanate. The thermodynamics calculation based on Maxwell's relations leads to similar conclusion. Such EC effect shows relaxation with the heat release process more significant than the heat adsorption process when the applied field is switched, which is different with those occur near the ferroelectric- to-paraelectric transition temperatures. Furthermore, the electro-caloric energy conversion relation or the scaling relation between the maximum refrigeration effect ΔH max and the applied field E, is found to follow a power law ΔH max∼E b with b=1.72, which is significantly larger than those for EC effects related with the ferroelectric-to-paraelectric transitions.
URI: http://hdl.handle.net/10397/12295
ISSN: 1013-9826
EISSN: 1662-9795
DOI: 10.4028/www.scientific.net/KEM.519.10
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