Abstract
The transformation curve of V 3Te 4 (with a superstructure of the Cr 3S 4 type) into the corresponding high temperature phase (with a partially filled CdI 2-type structure) is calculated using a statistical model derived in a previous paper. A long-range order parameter ν is defined and it is demonstrated that the ordered superstructure breaks down when a certain defect concentration corresponding to a critical value ν c=0.79 is reached. It is also shown that the asymmetrical shape of the transformation curve can only be explained if an additional (5:8)-type superstructure is present within the homogeneity range of the V 3Te 4-phase. The calculated phase boundary is in good agreement with the experimentally determined phase diagram.
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