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Short-Range Order in Se-Rich Ge–Se Glasses—An Extended X-Ray Absorption Fine Structure Study

✍ Scribed by Egil Gulbrandsen; Hege Britt Johnsen; Monica Endregaard; Tor Grande; Svein Stølen

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 204 KB
Volume: 145
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1999.8259

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✦ Synopsis

The short-range order in vitreous Ge 1؊x Se x (2/34 4x4 41) at 80 K was studied by EXAFS spectroscopy at the Ge and Se K-edges. The results were analyzed using theoretical phase shift and amplitude functions and by comparison to crystalline GeSe 2 and Se as model compounds. The GeSe 4 tetrahedron is the main structural entity for all the Ge+Se alloys. The results indicate a slight increase in Ge coordination and a decrease in Se coordination with increasing Se content. Possible sources of error are discussed, and possible origins of the structural changes are suggested.

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Short and Medium Range Order in Ga–Ge–S Glasses: An X-Ray Absorption Spectroscopy Study at Room and Low Temperatures

✍ A.M. Loireau-Lozac'h; F. Keller-Besrest; S. Bénazeth 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 258 KB

main extends from GeS 2 to the composition with n ϭ 0.55 Glasses belonging to the Ga 2 S 3 -GeS 2 line are studied at room (n ϭ Ga/(Ga ϩ Ge)). The XAFS spectroscopy (X-ray temperature and at 7 K by XAFS spectroscopy at Ga and Ge absorption fine structure) is well suited to investigate sepa-K-edges.