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The Study of the Formation and Growth of Ni-Al Spinel Using a New, Thin-Film, Specimen Geometry

Published online by Cambridge University Press:  28 February 2011

Y. Kouh Simpson  and
C. B. Carter
Y. Kouh Simpson
Affiliation:
Department of Materials Science and Engineering, Bard Hall, Cornell University, Ithaca, NY 14853
C. B. Carter
Affiliation:
Department of Materials Science and Engineering, Bard Hall, Cornell University, Ithaca, NY 14853
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Abstract

The formation of nickel-aluminate spinel during the reaction between nickel oxide and alumina has been studied by a new approach which utilizes a thin-film substrate of alumina. It is found that the spinel grows in either near- or exact-topotactic alignment along the edges of the thin-film substrate. It also grows on and into the surface of the substrate, but the deviation from exact topotaxy then tends to be larger. The topotactic relationship is such that the (0001) of the alumina is parallel or nearly parallel to the {111} planes of the spinel with <1100> parallel to <110>. A second orientation relatioship is found where the {1120} of the alumina is parallel or nearly parallel to the {111} planes of the spinel; <1100> is again parallel to <110>. First order twin boundaries are found to be common in the spinel particles which have grown on the edge of the thin alumina substrate. Direct observation of the change in the orientation of the spinel twins with respect to the alumina substrate after reannealing is reported. The morphology of the various types of spinel particles is discussed briefly.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 60: Symposium L – Defect Properties and Processing of High-Technology Nonmetallic Materials , 1985 , 265
Copyright
Copyright © Materials Research Society 1986

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