Investigation of the electrocaloric effect in a PbMg2/3Nb1/3O3-PbTiO3 relaxor thin film

T. M. Correia*, J. S. Young, R. W. Whatmore, J. F. Scott, N. D. Mathur, Q. Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

199 Citations (Scopus)

Abstract

Permittivity measurements of a 0.93PMN-0.07PT thin film show a broad maximum near 35 degrees C, and an anomaly at the depolarizing temperature T-d=18 degrees C on heating only, suggesting a dipolar glass-relaxor phase transition. No structural phase transition at 18 degrees C is apparent from ferroelectric hysteresis loops taken on field cooling and field heating. These loops show the thermal hysteresis expected for ferroelectric relaxors, which has not hitherto been experimentally verified in PbMg2/3Nb1/3O3-PbTiO3 thin films. Our data suggest the intriguing possibility of a giant electrocaloric effect (Delta T=9 K, Delta E=720 kV cm(-1)) at and near room temperature.

Original languageEnglish
Article number182904
Number of pages3
JournalApplied Physics Letters
Volume95
Issue number18
DOIs
Publication statusPublished - 2 Nov 2009

Keywords

  • dielectric hysteresis
  • ferroelectric thin films
  • ferroelectric transitions
  • lead compounds
  • magnesium compounds
  • pyroelectricity
  • relaxor ferroelectrics
  • ELECTROMECHANICAL PROPERTIES
  • FERROELECTRICS
  • BEHAVIOR
  • NIOBATE
  • CERAMICS

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