Ferroelectric-to-Ferroelectric Phase Transition Induced Electro-Caloric Energy Conversion in Barium Titanate at Room Temperature

K. Ding; G.P. Zheng; Y. Shen

doi:10.4028/www.scientific.net/KEM.519.10

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Microencapsulated Phase Change Materials and its Application in Thermal-Regulated Fibers
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Ferroelectric-to-Ferroelectric Phase Transition Induced Electro-Caloric Energy Conversion in Barium Titanate at Room Temperature
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Ferroelectric-to-Ferroelectric Phase Transition Induced Electro-Caloric Energy Conversion in Barium Titanate at Room Temperature

Abstract:

The electro-caloric 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 changed, 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 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.