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

Local motifs in GeS2–Ga2S3 glasses

“…The first value is similar to what was found in the Ge 25 (As,Ga) 10 S 65 system [41], in crystalline GeS 2 [61], and in GeS x glasses [59,60]. The third coordination shell around Ge at r Ge-Ge 3.5 Å found in earlier publications [40,59,60] seems to decompose a shorter ES (r = 3.4 Å) and a longer CS (r = 3.6 Å) distances in our simulation models. The split peak of edge-sharing Ge-Ge distances may be caused by differences in the local environment of the participating Ge atoms (e.g.…”

“…The Ge-S and Ga-S distances agree with the literary values [40][41][42]. Due to the lower concentration of Ga, the uncertainty of Ga-Ga bond length is somewhat higher.…”

“…The effect of the sulfur deficiency is investigated by the connections of the sulfur atoms: if they are participating in edge-share connections or only in corner-share relations. It was suggested that the S-deficiency can be compensated by the formation of edge linkages between [(Ge/Ga)S 4/2 ] units [40].…”

“…These works also use several different methods such as Raman [12,[36][37][38][39], XAFS [40], neutron diffraction [41], EXAFS [42], XRD and Raman [43], 2D micro-Raman [44]. They have all found that Ge and Ga atoms are equally fourfold coordinated, [GaS 4 ] and [GeS 4 ] tetrahedral units are cross-linked via bridging sulfur atoms, M-chalcogen bonds are preferable.…”

Free‐volume nanostructural transformation in crystallized GeS2–Ga2S3–CsCl glasses

“…1. However, as compared to (80GeS 2 -20Ga 2 S 3 ) 90 (CsCl) 10 glasses, in (80GeS 2 -20Ga 2 S 3 ) 85 (CsCl) 15 chalcogenide glass the lifetime τ 2 decreases and the intensity I 2 increases, proving a possible void fragmentation [15]. Such a free-volume transformation is caused by loosening of inner glass structure when CsCl content is high.…”