Entropy-change measurement of electrocaloric effect of BaTiO3single crystal

Yang Bai, Kai Ding, Guangping Zheng, San-Qiang Shi, Lijie Qiao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

65 Citations (Scopus)

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 ΔS was calculated from the temperature integral of specific heat capacities based on the basic definition of entropy. The ΔS-T curve of BaTiO3single crystal showed a sharp peak around Tc, which increased gradually and shifted to higher temperature with the rise of applied field. A high ECE with ΔS = 1.9 J/kg K and ΔT = 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.
Original languageEnglish
Pages (from-to)941-944
Number of pages4
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume209
Issue number5
DOIs
Publication statusPublished - 1 May 2012

Keywords

  • electrocaloric effect
  • entropy change
  • ferroelectrics
  • phase transitions

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

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