Phenomenology of relaxor-ferroelectric phase transitions

B. E. Vugmeister, H. Rabitz

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations

Abstract

We propose a phenomenological theory for the dielectric properties of relaxor ferroelectrics undergoing a `relaxor-ferroelectric' phase transition based on the assumption that the interacting polar clusters distributed in highly polarizable host lattice are responsible for relaxor behavior. Two major differences between relaxor ferroelectrics and conventional order-disorder ferroelectrics have been employed in the theory: i) the existence of the broad distribution of local fields experienced by each polar cluster; ii) the existence of the distribution of relaxation times giving rise to non-exponential non-critical kinetics which may compete with the critical slowing down near the ferroelectric phase transition temperature. We show that the theory is in good agreement with the experiment on frequency dependent permittivity in PbSc0.5Ta0.5O3 undergoing the first order ferroelectric phase transition.

Original languageEnglish (US)
Pages (from-to)265-273
Number of pages9
JournalFerroelectrics
Volume206-207
Issue number1 -4; 1-2
DOIs
StatePublished - Jan 1 1998
EventProceedings of the 1997 Williamsburg Workshop on Ferroelectrics - Williamsburg, VA, USA
Duration: Feb 2 1997Feb 5 1997

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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