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Origin of the relaxor state in Pb(B{x}B{1-x}{'})O(3) perovskites.

Authors
  • Tinte, Silvia
  • Burton, B P
  • Cockayne, Eric
  • Waghmare, U V
Type
Published Article
Journal
Physical review letters
Publication Date
Sep 29, 2006
Volume
97
Issue
13
Pages
137601–137601
Identifiers
PMID: 17026074
Source
Medline
License
Unknown

Abstract

Molecular dynamics simulations of first-principles-based effective Hamiltonians for Pb(Sc{1/2}Nb{1/2})O(3) under hydrostatic pressure and for Pb(Mg{1/3}Nb{2/3})O(3) at ambient pressure show clear evidence of a relaxor state in both systems. The Burns temperature is identified as the temperature below which dynamic nanoscale polar clusters form, pinned to regions of quenched chemical short-range order. The effect of pressure in Pb(Sc{1/2}Nb{1/2})O(3) demonstrates that the stability of the relaxor state depends on a delicate balance between the energetics that stabilize normal ferroelectricity and the average strength of random local fields which promote the relaxor state.

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