Vibrational spectra and structure of AsPS glasses

• Published in: Journal of non-crystalline solids 1991-09, Vol.134 (1), p.86-93
• Main Authors: Koudelka, L., Pisárčik, M., Blinov, L.N., Gutenev, M.S.
• Format: Article
• Language: English
• Subjects: Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Lattice dynamics; Physics; Vibrational states in disordered systems
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/0022-3093(91)90014-W

A structural model for AsPS glasses is proposed from an analysis of Raman and infrared spectra of two series of glasses with compositions (As 2S 3) 1 − x (P 2S 5) x with x = 0 – 0.7 and As x P x S 1−2 x with x = 0.10-0.16. The structural network in these glasses is composed of AsS 3 2 and S=PS 3 2 structural units forming 8-membered rings of As 2P 2S 4. The Raman spectra of these glasses are characterized by a sharp strong Raman band of 418 cm −1 ascribed to the breathing vibration of the rings. In the S-rich compositional region lying under the As 2S 3P 2S 5 line, towards the S corner of the AsPS phase diagram, sulfur atoms form S 8 molecules inside the structural network. In the 31P MAS-NMR spectrum by a single line with the chemical shift δ( 31 P) = 113.4 ppm is due to the S= PS 3 2 coordination of the phosphorus atom.