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The Early Stages of the Spinel-Alumina Phase Transformation

Published online by Cambridge University Press:  25 February 2011

Y. Kouh Simpson  and
C. B. Carter
Y. Kouh Simpson
Affiliation:
Materials Science and Engineering, Cornell University, Ithaca, N.Y. 14853.
C. B. Carter
Affiliation:
Materials Science and Engineering, Cornell University, Ithaca, N.Y. 14853.
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Abstract

The initial stage of topotactic growth of Ni-Al spinel into Al2O3 has been examined using transmission electron microscopy. A new experimental approach to the study of solid-state reactions, which may be adapted for in-situ experiments for low-temperature systems, has been used in this study. In its present form, the technique involves heating a thin film of one oxide in the presence of a vapor of the second oxide. In the study of the growth characteristics of Ni-Al spinel phase, the orientation of the Al2O3 substrate has been found to influence greatly both the structural and morphological aspects of the spinel growth. In particular, the topotactic relationship between the spinel and the alumina are very different for (0001) and {1120} substrate orientations. The very early stage of the kinetics of the spinel growth, in which the length and the width of the spinel particles are only a few hundred angstroms, is illustrated with the results obtained from the re-heating experiments. The structure of the spinel-alumina interface has also been studied using high-resolution electron microscopy. These results are discussed in relation to the different models proposed for the spinel-alumina phase transformation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 94: Symposium D – Initial Stages of Epitaxial Growth , 1987 , 45
Copyright
Copyright © Materials Research Society 1987

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References

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