Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/32171
Title: Entropy-change measurement of electrocaloric effect of BaTiO3 single crystal
Authors: Bai, Y
Ding, K
Zheng, GP 
Shi, SQ 
Qiao, L
Keywords: Electrocaloric effect
Entropy change
Ferroelectrics
Phase transitions
Issue Date: 2012
Publisher: Wiley-V C H Verlag Gmbh
Source: Physica status solidi a - applications and materials science, 2012, v. 209, no. 5, p. 941-944 How to cite?
Journal: Physica Status Solidi A-Applications and Materials Science 
Abstract: We demonstrated a characterization method of entropy-change measurement for the study of the electrocaloric effect (ECE). After the specific heat capacity was measured under different applied fields using a differential scanning calorimeter (DSC) accompanied with DC power supply, the electrocaloric Delta S was calculated from the temperature integral of specific heat capacities based on the basic definition of entropy. The Delta S-T curve of BaTiO3 single crystal showed a sharp peak around T-c, which increased gradually and shifted to higher temperature with the rise of applied field. A high ECE with Delta S=1.9 J/kg K and Delta T=1.6 K is achieved under a quite low field of 10 kV/cm. The results agreed with the thermodynamic calculation. It provides a direct, precise, and time-efficient method for the electrocaloric studies.
URI: http://hdl.handle.net/10397/32171
ISSN: 1862-6300
DOI: 10.1002/pssa.201127695
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