A detailed neutronographic study of the bulk ZnSe crystals doped with vanadium up to the content commensurate with the solubility limit in a semiconductor matrix has been carried out for the first time at room temperature. The data that characterize nonuniformly-deformed states based on the cubic structural modification of the II–VI compounds are obtained. A simplified analysis of the broadening patterns of the diffraction profiles of main Bragg reflexes of the studied crystals shows that the resulting deformation covers macroscopic volumes, and the distribution of vanadium ions in the given cases may significantly deviate from the uniform distribution over volume. Relative to the initial cubic lattice, dominating trends towards symmetry changes preceding the phase stratification in the ZnSe crystals heavily doped with vanadium are revealed.
The systematic new formations observed in the reciprocal lattice of the cubic structural modification of a II–VI compound are characterized using a detailed neutron diffraction study of bulk semiconducting ZnSe crystals with an increased vanadium content. Direct evidence that the additional sites k = (1/3 1/3 1/3) 2π/ a ( k is the wave vector and a is cubic unit cell parameter) observed by neutron scattering in the crystals, in the case when they belong to mutually penetrated rotated sublattices, contain a superstructure contribution formed by short-wave deformation, is obtained for the first time. This structure state is determined as a pretransition to the concentration fcc–hcp phase transformation, and the basis functions that allow one to analyze atomic displacements, the correlation between which create distortion-type superstructures, are indicated for the transition through one-arm channel, considering the transitions by the star of wave vector k _5 of the fcc lattice.
The real structure of Zn1-хCoхSe (x=0.01; 0.15) volume cubic crystals was characterized by thermal neutrons scattering method. Characteristics of resulting micro strain fields formed by atomic displacements were obtained from analyses of tangential and radial profile scans of the structure peaks measured on investigated crystals. Indications of initial lattice destabilizations revealed in both crystals demonstrate that the character of the structure distortions is quality changed by increasing of Co-impurity content from extreme small amount to close to solubility limit level. In particular, growing probability of substructure crystallites appeared from reaching of high-level doping is accompanied by strain-tensions emerged on the whole volume of crystal.
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