Features of the Structure of GeX2 (X = S, Se) Chalcogenide Glasses (Review)
Journal Title: Фізика і хімія твердого тіла - Year 2014, Vol 15, Issue 4
Abstract
This article reviews studies on the structure of chalcogenide glasses obtained from compound GeX2 (X = S, Se). Parameters defining the structure of glassy alloys are usually determined by Fourier transformation of experimental data on X-ray, electron and neutron diffraction. The main structural units of considered glasses are tetrahedrons GeS(Se)4/2 with bond lengths 2,21 ? for Ge-S and 2,36 Å for Ge–Se bonds. The introduction of modifying additions, in particular Ag, increases these bond distances. In glassy alloys of the system Ge0,18Ga0,05Sb0,07S0,70 xSex at x > 0,10 the number of tetrahedra GeS4/2 decreases and new unit structures appear such as edge sharing tetrahedra Ge2S4S2/2 and S3Ge-S-GeS3, and a small number of mixed structural units GeS2Se. With further decreasing of Se content formation of corner sharing tetrahedra GeSe4/2 and edge sharing tetrahedra Ge2Se4Se2/2 is observed. Peculiarities of energy band structure in amorphous and glassy semiconductors due to theoretical models by Hubanov A.I., Cohen, Fritzche, Ovshinsky, Davis-Mott, Anderson are reviewed. It is shown, that each of these models has some advantages and imperfections and can explain experimental data within certain assumptions.
Authors and Affiliations
A. H. Kevshyn
Keywords
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