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.
|Number of pages||10|
|Journal||Zeitschrift fur Kristallographie - New Crystal Structures|
|Publication status||Published - 1982|