Short and Medium Range Order in Ga–Ge–S Glasses: An X-Ray Absorption Spectroscopy Study at Room and Low Temperatures
✍ Scribed by A.M. Loireau-Lozac'h; F. Keller-Besrest; S. Bénazeth
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 258 KB
- Volume
- 123
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
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. The results show that the addition of Ga 2 S 3 to the rately the evolution of Ga and Ge short range order sur-GeS 2 glass former leads to the formation of tetrahedral units roundings as a function of cation ratios. When performed at of GaS 4 , linked to the GeS 4 tetrahedra. Mainly low temperature low temperature (LT), this technique allows us to attempt measurements of the Ge K-edge allow an analysis of the short medium range order information. Two different XAFS and medium range order. As the Ga content increases a substistudies were done: one of the Ga K-edge, and the other tution takes place of corner-sharing linkages with edge-sharing of the Ge K-edge.
linkages of (Ge/Ga)S 4 tetrahedral units.