Abstract
Electron-optical study of the transformation behaviour in metalenriched chalcopyrite indicates that several metastable ordered variants occur in short term cooling experiments (Putnis and McConnell, 1976). The implications of this behaviour are discussed in relation to the theory of symmetry point ordering. This permits one to distinguish between three types of ordering transformation which differ markedly, both in the nature of the structural changes involved, and in their kinetics. A brief account of the theory of symmetry point ordering, based on a group-theoretical treatment by Landau and Lifshitz, is included. Analysis of the experimental results obtained on metal-enriched chalcopyrite indicate that metastable transformation behaviour in this system is associated with symmetry point ordering, and that partially ordered structures are produced.
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McConnell, J.D.C. K-Space symmetry rules and their application to ordering behaviour in non-stoichiometric (metal-enriched) chalcopyrite. Phys Chem Minerals 2, 253–265 (1978). https://doi.org/10.1007/BF00308177
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DOI: https://doi.org/10.1007/BF00308177