Ferroelectric-to-ferroelectric phase transition induced electro-caloric energy conversion in barium titanate at room temperature

K. Ding, Guangping Zheng, Y. Shen

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)

Abstract

The electro-caloric (EC) energy conversions in single-crystal and polycrystalline barium titanate samples are investigated using differential scanning calorimetry (DSC). The DSC measurement reveals a refrigeration effect of 0.1 J/g under an electric field of 15 kV/cm at T=17.5 °C, which is related with the ferroelectric-to-ferroelectric transition in barium titanate. The thermodynamics calculation based on Maxwell's relations leads to similar conclusion. Such EC effect shows relaxation with the heat release process more significant than the heat adsorption process when the applied field is switched, which is different with those occur near the ferroelectric- to-paraelectric transition temperatures. Furthermore, the electro-caloric energy conversion relation or the scaling relation between the maximum refrigeration effect ΔHmaxand the applied field E, is found to follow a power law ΔHmax∼Ebwith b=1.72, which is significantly larger than those for EC effects related with the ferroelectric-to-paraelectric transitions.
Original languageEnglish
Title of host publicationMaterials for Energy Conversion and Storage
Pages10-13
Number of pages4
DOIs
Publication statusPublished - 1 Nov 2012
Event2012 International Workshop on Materials for Energy Conversion and Storage - Shenzhen, China
Duration: 23 Mar 201225 Mar 2012

Publication series

NameKey Engineering Materials
Volume519
ISSN (Print)1013-9826

Conference

Conference2012 International Workshop on Materials for Energy Conversion and Storage
CountryChina
CityShenzhen
Period23/03/1225/03/12

Keywords

  • Calorimetry
  • Electro-caloric effect
  • Energy conversion
  • Lead-free ferroelectrics

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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