Structures related to those of spinel and the ß-phase, and a possible mechanism for the transformation olivine ↔ spinel

B. G. Hyde, T. J. White, M. O'Keeffe, A. W. S. Johnson

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38 Citations (Scopus)

Abstract

The structures of intermediate phases, such as the ß-phase, are shown to be readily derived from that of spinel (y) by the regular insertion of anti-phase boundaries (apbs) or mirror planes parallel to (010) of the body-centered tetragonal unit cell of the latter [[unk)]10) planes of the face-centred cubic cell]. The process leads eventually to a hypothetical structure, ω, from which y, ß, etc. can be derived by similar apbs. Unit layers parallel to (0[unk]2) in the ω structure are identical to those parallel to (001) in olivine (a, setting Pnma). A simple mechanism is proposed for the transformation α ω. Further transformation to ß etc. and y requires only slip, to generate apbs.

Original languageGerman
Pages (from-to)53-62
Number of pages10
JournalZeitschrift fur Kristallographie - New Crystal Structures
Volume160
Issue number1-2
DOIs
Publication statusPublished - 1982
Externally publishedYes

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