EXAFS of Cd1−xZnxTe: A test of the random distribution in zincblende ternary alloys

摘要: We present EXAFS measurements on a few semiconducting, zincblende II–VI alloys. The reveal the real microscopic structure of these materials which is different from that pure constituents. Although lattice constant alloys change considerably with composition, near-neighbour anion-cation bond lengths stay almost undisturbed in comparison those materials, while next-near-neighbour distances show complicated multi-modal distribution. These experimental facts led to formulation structural model for such and allowed estimate elastic energy distorted crystal lattice. This, turn, was used describe thermodynamic functions mixing. In particular, we derive interaction parameter critical temperature framework quasi-chemical approximation address problem correlations chemical disordered sublattice.