Structural disorder and phase transition in Pb1-xSnxTe1-ySey
Year: 1990
Type: article
Abstract: From the analysis of the temperature dependence of resistivity in the Pb1-xSnxTe1-ySey quaternary solid solution in the whole region of its existence, the compositional dependence of the temperature of phase transition in it was determined. It was shown that the phase transition is caused by the presence of off-center Sn atoms, the ordering of whose dipole moments at small x is impossible because of the high rate of inter-well tunneling. In the conditions of statistical disorder caused by atomic substitution in the anion sublattice, the rate of tunneling decreases and the phase transition becomes possible. With increasing x, the phase transition in the samples acquires the properties of a displacive phase transition; this is consistent with theoretical predictions about the properties of a system of interacting particles which move in a multi-minimum potential with shallow wells.
Authors: Lebedev, Alexander, Sluchinskaya, Irina
Institution: Lomonosov Moscow State University
Language: Russian
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7103884275