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Influence of Crystallographic Orientation, Chemical Inhomogeneities, Material Transport Anisotropy and Elastic Strain Energy on the Migration of Grain Boundaries in Chromium-Doped Alumina During Internal Reduction

Published online by Cambridge University Press:  15 February 2011

Monika Backhaus-Ricoult ,
A. Peyrot-Chabrol ,
R. Chiron  and
S. Hagege
Monika Backhaus-Ricoult
Affiliation:
Centre d'Etudes de Chimie Metallurgique, CNRS, 15 Rue G.Urbain, 94407 Vitry, France
A. Peyrot-Chabrol
Affiliation:
Centre d'Etudes de Chimie Metallurgique, CNRS, 15 Rue G.Urbain, 94407 Vitry, France
R. Chiron
Affiliation:
LPMTM, CNRS, Villetaneuse, France
S. Hagege
Affiliation:
Centre d'Etudes de Chimie Metallurgique, CNRS, 15 Rue G.Urbain, 94407 Vitry, France
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Abstract

Diffusion-induced grain boundary migration is observed during internal reduction of chromium-doped alumina. It occurs because grain boundary diffusion is fast compared to lattice diffusion of oxygen. The oxygen chemical potential relaxes between grain boundaries and adjacent grains. Migration to either side of the boundary is controlled by multiple factors: chemical composition differences between adjacent grains, elastic strain energy differences on the two sides of the boundary plane or by more rapid oxygen relaxation when the c-axis of a grain is perpendicular to the boundary plane.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 357: Symposium C – Structure and Properties of Interfaces in Ceramics , 1994 , 293
Copyright
Copyright © Materials Research Society 1995

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References

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