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New arguments in support of the off-center positions of the tin atoms in PbSnTeSe and PbSnTeS The paper is published in Sov. Phys. - Solid State 34, 793-795 (1992).

New arguments in support of the off-center positions of the tin atoms in Pb1-xSnxTe1-ySey and Pb1-xSnxTe1-ySy

A.I. Lebedev, I.A. Sluchinskaya
M.V. Lomonosov State University, Moscow, Russia

Investigations of the electrical properties of PbSnTeS, PbSnTeSe, and PbSnSeS solid solutions confirmed an earlier hypothesis that the positions of the tin atoms were off-center and that the tunnel motion of these atoms were suppressed in the anion sublattice. In the case of PbSeTeS, containing two off-center impurities Sn and S, the ranges of compositions in which the ferroelectric phase transition was induced by the off-center Sn and S impurities were separated by a region with a disordered dipole structure.

Other works on off-center impurities