Abstract
We have performed an extended x-ray-absorption fine-structure (EXAFS) measurement of Te solid solutions for various concentrations x in the single-phase range 0≤x≤0.7. Data have been collected on the Mn K, Cd , and Te edges. We have found well-defined different nearest-neighbor Cd-Te and Mn-Te distances almost independent of x. A model of the microscopic structure of the zinc-blende-type C ternary alloys based on a random distribution of cations has been developed. The model describes the bimodal distribution of near-neighbor distances in terms of distortion of the anion sublattice (the cation sublattice is assumed to remain fixed) with use only of the lattice constants of the alloy and the bond-stretching constants of each binary component. Its application to Te and As alloys is proved to be in good agreement with the EXAFS results. Within the framework of this model we also consider the problem of the structural stability of Te.
- Received 26 December 1984
DOI:https://doi.org/10.1103/PhysRevB.31.7526
©1985 American Physical Society