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A computer simulation study of Al/Si ordering in gehlenite and the paradox of the low transition temperature
Authors:S Thayaparam  Martin T Dove  Volker Heine
Institution:1. Cavendish Laboratory, University of Cambridge, Madingley Road, CB3 OHE, Cambridge, UK
2. Department of Earth Science, University of Cambridge, Downing Street, CB2 3EQ, Cambridge, UK
Abstract:The ordering of Al and Si in gehlenite is considered using computer simulation. The enthalpy of ordering ΔH per 2Al+2Si atoms is found to be 0.52 eV. It is dominated by the nearest neighbour interaction, but the analysis is carried out to fifth neighbours. The nearest neighbour interaction differs significantly from that for other materials. The structure does not have a connected network of ordering sites, which mainly accounts for the unobservably low transition temperature for Al/Si ordering. Two alternatives are given for the likely ordering pattern.
Keywords:
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