Ukrainian Journal of Physical Optics

Number 4, Volume 2, 2001

Absorption edge of Sn(Pb)₂P2S(Se)₆ crystals under hydrostatic pressure
Slivka A.G.

Uzhhorod National University,Faculty of Physics, Voloshyn St. 32, Uzhhorod, 88000, Ukraine

The experimental studies of hydrostatic pressure effect upon fundamental optical absorption spectra in Sn(Pb)₂P₂S(Se)₆ mixed crystals of different composition are carried out. The increase of Pb content in (PbySn_1-y)₂P₂S6, (PbySn)₂P₂Se₆ crystals is shown to result in the enhancement of electron-phonon interaction and to the reduction of the energy gap deformation potential D_g. Isomorphous substitution of S by Se in the Sn2P2(S_xS_1-x)₆ solid solution row does not affect significantly the electron-phonon interaction value and D_g.

Keywords: Urbach absorption edge, ferroelectrics, phase transitions, hydrostatic pressure

doi 10.3116/16091833/2/4/171/2001

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