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Entropy‐change measurement of electrocaloric effect of BaTiO 3 single crystal
Author(s) -
Bai Yang,
Ding Kai,
Zheng GuangPing,
Shi SanQiang,
Qiao Lijie
Publication year - 2012
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201127695
Subject(s) - electrocaloric effect , thermodynamics , materials science , heat capacity , entropy (arrow of time) , differential scanning calorimetry , condensed matter physics , single crystal , electric field , ferroelectricity , physics , nuclear magnetic resonance , optoelectronics , quantum mechanics , dielectric
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 Δ S was calculated from the temperature integral of specific heat capacities based on the basic definition of entropy. The Δ S–T curve of BaTiO 3 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 Δ S = 1.9 J/kg K and Δ 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.