A quasielastic light scattering study of the 1q to 2q transition within the incommensurate phase of Ba2NaNb5O15

W. F. Oliver, J. F. Scott, S. A. Lee, S. M. Lindsay

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11 Scopus citations

Abstract

Inelastic light scattering in incommensurate (IC) Ba2NaNb 5O15 reveals a dynamic central mode whose width satisfies tau -1(q,T)=D(T)q2 with diffusivity D(T) exhibiting a maximum of 0.85 cm2 s-1 at TR approximately=565 K, the temperature at which electron microscopy shows an abrupt roughening transition within the antiphase boundaries (APBs). This phase change involves a transition from modulation along one axis (1q) to modulation along two orthogonal axes (2q). The dynamic central mode is also observed to couple strongly with the (100) longitudinal acoustic (LA) phonon.

Original languageEnglish (US)
Article number016
Pages (from-to)2465-2471
Number of pages7
JournalJournal of Physics: Condensed Matter
Volume2
Issue number10
DOIs
StatePublished - Dec 1 1990
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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