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The Cross-Linked Chain-Cluster Model for Low Dimensional SixSe1−x Inorganic Polymer Glasses

Published online by Cambridge University Press:  25 February 2011

James E. Griffiths
James E. Griffiths*
Affiliation:
AT&T, Bell Laboratories, Murray Hill, New Jersey 07974
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Abstract

Crystalline SiSe2 and a series of Six Se1−x clear yelloworange glasses (0.33 × 0.40) were synthesized from the elements and were studied by Raman spectroscopy. Spectra of crystals were analysed in terms of the crystal structure of SiSe2 whereas for the glasses a new cross-linked chain-cluster (CLCC) model is proposed and forms the basis of extensive spectral analysis. Extended chain only and random network models are inconsistent with the data. The CLCC model is characterized by well defined chains of edge-sharing (SiSe4) tetrahedra, as in the crystal, which are cross-linked via corner sharing (SiSe 4) tetrahedra to form very large highly viscous inorganic polymers. The structure has considerable medium range order and provides for a self-consistent mechanism for transition to non-stoichiometric glasses in the range SiSe 2 to Si2 Se3 The smooth transition is monitored through spectral changes i the Si-Se vibrational stretching region from 150 to 300 cm and in the regiof of the collective modes at lower frequencies from 0 to 150 cm The frequencies and band contours of the latter dramatically track the introduction of disorder as the compositions move away from the stoichiometric SiSe 2 composition. The CLCC model is quite different from the raft model for GeSe 2 in some ways just as the crystalline structures of SiSe 2 and GeSe 2 differ from each other. Photoactivity in GeSe glass is one consequence of these structural differences in the two vitreous materials.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 61: Symposium P – Defects in Glasses , 1985 , 75
Copyright
Copyright © Materials Research Society 1986

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