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

doi:10.1088/0953-8984/2/10/016

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 T_R 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 language	English (US)
Article number	016
Pages (from-to)	2465-2471
Number of pages	7
Journal	Journal of Physics: Condensed Matter
Volume	2
Issue number	10
DOIs	https://doi.org/10.1088/0953-8984/2/10/016
State	Published - Dec 1 1990
Externally published	Yes

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

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10.1088/0953-8984/2/10/016

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

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.",

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T1 - A quasielastic light scattering study of the 1q to 2q transition within the incommensurate phase of Ba2NaNb5O15

AU - Oliver, W. F.

AU - Scott, J. F.

AU - Lee, S. A.

AU - Lindsay, S. M.

PY - 1990/12/1

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N2 - 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.

AB - 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.

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

Abstract

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