https://doi.org/10.15407/spqeo5.04.385
Semiconductor Physics, Quantum Electronics & Optoelectronics. 2002. V. 5, N 4. P. 385-390.
PACS: 73.61.Jc, 77.22.-d
Polarization properties and a local structure
of (GeSe2)x(Sb2Se3)1-x
glasses
V.I. Malesh, V.V. Rubish, I.I. Shpak,
V.M. Rubish, P.P. Puha*
Uzhhorod National University, 54
Voloshin str., 88000 Uzhhorod, Ukraine
* Institute of Ålectron Physics, NAS of Ukraine, 21 Universytets'ka str.,
88000 Uzhhorod, Ukraine
Abstract.
The results of investigating different parameters (
of
glasses in Ge-Sb-Se system have been given. The values of structural-sensitive
molar IR polarization F have been calculated and its concentrational
dependence has been constructed. The polarity of chemical bonds has been
estimated. It has been shown that with increasing the content of Sb2Se3 in the composition of the glasses the polarity of Sb-Se bonds rises. Within
the limits of free volume conception the formation energy (Eh)
and the volume (Vh)
of microcavities have been calculated. Eh
and Vh
are structural-sensitive parameters of glassy materials.
It has been shown that the inflection is observed in concentrational dependences
of investigated and calculated parameters of (GeSe2)x(Sb2Se3)1-x glasses in the vicinity of x
= 0.60. It testifies to the structural changes in the glasses while changing
the composition.
The structure of (GeSe2)x(Sb2Se3)1-x glasses is mainly determined by structural units GeSe4/2
and SbSe3/2,
to be statistically distributed into matrices. The increase of Sb2Se3 content in GeSe2
is accompanied by a gradual transition from tetrahedrally co-ordinated
structural units in glassy GeSe2,
to trigonally co-ordinated - in Sb2Se3.
Keywords:
chalcogenide glass, polarization, local structure, structural units.
Paper received 25.10.02; accepted
for publication 17.12.02.
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