Glass formation and properties of chalcogenide systems XXXII. RDF studies on the structure of vitreous Ge2S3 and Ge2Se3

Unraveling the atomic structure of Ge-rich sulfide glasses

“…1. The published diffraction data for g-GeS 2 and some Ge-rich glasses 7,[14][15][16] are similar to our results.…”

“…A simplified approach was used instead by taking into consideration the first two members of the Ge(Ge m S 4Àm ) family: GeS 4 (m = 0) and Ge(GeS 3 ) considered as a dimer S 3 Ge-GeS 3 and allowing a free rotation around the Ge-Ge bond. 15 The Ge 2 S 3 glass (x = 0.4) was suggested to be entirely built up by these corner-sharing ethylene-like units. 15 The experimental partial and total germanium coordination numbers are shown in Fig.…”

“…15 The Ge 2 S 3 glass (x = 0.4) was suggested to be entirely built up by these corner-sharing ethylene-like units. 15 The experimental partial and total germanium coordination numbers are shown in Fig. 8(A).…”

“…The diffraction studies of Ge-rich sulfide glasses have only been carried out in a limited Q-range with resulting insufficient resolution in r-space to distinguish between the two limiting cases. 11,[14][15][16] Unraveling the atomic structure of Ge-rich sulfide glasses using diffraction measurements over a wide Q-range is the main goal of this paper. The critical point in elucidating the local germanium environment is to distinguish between Ge-Ge and Ge-S bonds at 2.4-2.5 Å characteristic of tetrahedral and distorted NaCl models, respectively.…”

Self-trapping of single and paired electrons in Ge2Se3

“…In equilibrium, the material phase separates into rhombohedral GeSe and GeSe 2 . Several groups have studied the structure of bulk glass [7,[10][11][12][13] and thin film [5,[14][15][16][17] forms of the material. Based on the study of radial distribution functions (RDF) of both Ge 2 Se 3 and Ge 2 S 3 , Pohle et al [12] concluded that these glasses are chemically ordered and are comprised of Ge 2 X 6 units: where X = S or Se, connected through twofold-coordinated chalcogen atoms.…”