The temperature-frequency studies of dielectric susceptibility in Sn₂P₂S₆, Sn₂P₂Se₆, (PbySn₁−y)₂P2Se₆ and crystals at low temperatures are reported. The freezing relaxation dynamics has been observed in a temperature-frequency ...

Polarizable ion model was used in describing the lattice dynamics in the Sn₂P₂S₆ and Sn₂P₂Se₆ ferroelectric crystals and their solid solutions. There has been obtained a good agreement of the calculated phonon spectra ...

Size effect on the fundamental properties of Sn₂P₂S₆ ferroelectric is studied. The decrease of Raman peak frequency, accompanied by the band broadening and asymmetry, is observed in the spectra of microcrystalline Sn₂P₂S₆ ...

Statistical theory for ferroelectrics based on triple well anharmonic potential was used for the case of structural second order phase transition in Sn₂P₂S₆ crystals. Parameters of effective Hamiltonian of the model ...