Premium
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.
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom