A quasielastic light scattering study of the 1q to 2q transition within the incommensurate phase of Ba2NaNb5O15
- 12 March 1990
- journal article
- letter
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 2 (10), 2465-2471
- https://doi.org/10.1088/0953-8984/2/10/016
Abstract
Inelastic light scattering in incommensurate (IC) Ba2NaNb5O15 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.Keywords
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