Electro-caloric behaviors of lead-free Bi0.5Na0.5TiO3-BaTiO3ceramics

Xiu Cheng Zheng, Guangping Zheng, Zheng Lin, Zhi Yuan Jiang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

42 Citations (Scopus)

Abstract

Electro-caloric (EC) properties of lead-free Ba0.5Na0.5TiO3-xBaTiO3(BNT-xBT) ceramics prepared by citrate method are investigated at temperatures of 30-250°C. Based on thermodynamics calculations, BNT-xBT (x00, 0.05, 0.06, 0.1, 0.25, 0.3) are found to show EC effects different with other lead-based or lead-free ferroelectric ceramics, i.e., they absorb heats (refrigeration effect) during the processes of field application while other ferroelectric ceramics show refrigeration effect during the processes of field removal. The EC temperature change of BNT-xBT can be as large as 2.1°C under an electric field of 60 kV/cm, which is larger than most of the lead-free ferroelectric bulk ceramics. When x is close to the morphotropic phase boundary (x∼0.06-0.1), the EC temperature change of BNT-xBT shows a maximum near the ferroelectric to anti-ferroelectric transition temperature, which is characterized by dynamic mechanical analysis. This study suggests that these lead-free ferroelectric materials are promising in the practical application as EC coolers.
Original languageEnglish
Pages (from-to)20-26
Number of pages7
JournalJournal of Electroceramics
Volume28
Issue number1
DOIs
Publication statusPublished - 1 Feb 2012

Keywords

  • Electro-caloric effect
  • Ferroelectrics
  • Structural phase transformations

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Materials Chemistry
  • Electrical and Electronic Engineering

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