Entropy-change measurement of electrocaloric effect of BaTiO3single crystal

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

doi:10.1002/pssa.201127695

Entropy-change measurement of electrocaloric effect of BaTiO₃single crystal

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

Research output: Journal article publication › Journal article › Academic research › peer-review

94 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 language	English
Pages (from-to)	941-944
Number of pages	4
Journal	Physica Status Solidi (A) Applications and Materials Science
Volume	209
Issue number	5
DOIs	https://doi.org/10.1002/pssa.201127695
Publication status	Published - 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

More information

10.1002/pssa.201127695

Cite this

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title = "Entropy-change measurement of electrocaloric effect of BaTiO3single crystal",

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.",

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author = "Yang Bai and Kai Ding and Guangping Zheng and San-Qiang Shi and Lijie Qiao",

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AU - Bai, Yang

AU - Ding, Kai

AU - Zheng, Guangping

AU - Shi, San-Qiang

AU - Qiao, Lijie

PY - 2012/5/1

Y1 - 2012/5/1

N2 - 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.

AB - 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.

KW - electrocaloric effect

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