Entropy‐change measurement of electrocaloric effect of BaTiO₃ single crystal

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.