The Electrocaloric Effect of BaTiO₃ Ceramics Using Hydrothermal Synthesized Nano-Sized Starting Powders

Abstract:

The electrocaloric effect (ECE) of barium titanate ceramics with hydrothermal synthesized nano-sized starting powders was investigated. The Curie point and latent heat of the phase transition were characterized by a differential scanning calorimeter (DSC). The P-E hysteresis loops were measured in the temperature range from 30-160oC and ECE adiabatic temperature change was obtained according to the Maxwell relation. A double hysteresis loop is observed at the temperature slightly above the Curie point, which indicates a good consistency of phase transition similar to single crystal. It is also proved by the sharp endothermic peak of phase transition in DSC curves. It exhibits a high ECE of ΔTmax=1.3K under a low applied field of 10kV/cm, which is much higher than that of the sample using micron-sized starting powders.

• Periodical: Advanced Materials Research (Volume 624)
• Pages: 138-141
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.624.138
• Online since: December 2012
• Authors: Xi Han, Yang Bai, Li Jie Qiao
• Keywords: Electrocaloric Effect, Ferroelectric, Nanometer Powders, Phase Transition

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