Open AccessО возможных состояниях кристаллической структуры, предшествующих фазовому переходу в кристаллах Zn-=SUB=-1-x-=/SUB=-V-=SUB=-x-=/SUB=-Se (0.01≤ x≤0.10)
Author(s) -
В.И. Максимов,
Е.Н. Максимова,
Т.П. Суркова,
А.П. Вохмянин
Publication year - 2019
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2019.01.46892.169
Subject(s) - neutron diffraction , superstructure , crystallography , diffraction , reciprocal lattice , condensed matter physics , wave vector , vanadium , lattice constant , lattice (music) , phase transition , crystal structure , materials science , chemistry , physics , optics , thermodynamics , inorganic chemistry , acoustics
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.