Local lattice strains in the system of cubic Zn_(0.999)Fe _(0.001)S _x Se_(1 - X) (0 ≤ x ≤ 1) crystals

摘要

The structure of cubic Zn_(0.999)Fe_(0.001)S _x Se_(1 - x) (0 ≤ x ≤ 1) crystals obtained by vapor-phase chemical transport has been investigated by thermal-neutron diffraction. The diffraction patterns of these crystals are found to exhibit previously unknown diffuse-scattering effects related to local static atomic displacements in the metastable fcc lattice. It is substantiated that the tendency to form polytypes, which is characteristic to a greater extent of zinc sulfide, can be a key factor of instability in the lattice of compounds belonging to the series of anion-substituted solid solutions under study.