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Abstract : The thermodynamic theory of second order phase transitions in crystals with the modifications and simplifications recently made by the author and co-workers is applied to the rocksalt structure. We predict several lower symmetry phases achievable via second-order displacive transitions which do not change the unit cell, in addition to the trigonal structure seen in GeTe. A microscopic model is proposed for such transitions, involving space-group configurational Jahn-Teller instability of a proposed valence-bond model of electronic structure of binding of these compounds. Some experimentally verifiabIe tests of these proposals are given.





Autor: Joseph Birman

Fuente: https://hal.archives-ouvertes.fr/



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