Abstract
We report EXAFS (extended X-ray absorption fine structure) measurements above the L III edge of Te in Cd 1− x Zn x Te for five compositions x. As in other II–VI zincblende ternary alloys we find that the distribution of near-neighbours is bimodal and closer to the Pauling-Huggins limit than to the virtual crystal approximation limit. This behaviour is predicted by a model based on a random distribution of cations on a fcc sublattice and a highly distorted fcc sublattice for anions. The distribution of second nearest neighbours is multimodal. Within the framework of this model we compute the mixing free energy and the critical temperature using the Bragg-Williams approximation.
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