How silver influences the structure and physical properties of chalcogenide glass (GeS2)50(Sb2S3)50

Abstract

The presented study shows how the incorporation of silver changes the structure and physical properties of chalcogenide glass (GeS2)50(Sb2S3)50. Nine samples with silver content (0-25 at. %) were studied to give a detailed picture. The structure and its changes were analyzed by Raman spectroscopy. The main structural units of the (GeS2)50(Sb2S3)50 glass and its medium range order were described. Interaction of silver and hosting (GeS2)50(Sb2S3)50 matrix was described by a set of chemical reactions. The weakest part of the hosting matrix, two interconnected SbS3/2 pyramids, was identified. Such structural motif was identified as the doorway for silver incorporation. The material hardness is significantly increased by up to 26% due to silver addition. The ability of silver to fill cavities in a glass is responsible for the observed hardness increase. Electronic properties and silver ion mobility were examined by impedance spectroscopy and radioactive tracer diffusion. The purpose of the presented study is to give an instructive description of how silver change the structure of the studied chalcogenide glass and give a complex feeling of how the silver changes its physical properties.

Investigation of the Atomic Structure of Ge-Sb-Se Chalcogenide Glasses

“…Thus, the 4-coordinated Ge unit connects through a Se atom to a 3-coordinated Sb unit and, therefore, the first neighbour distance of Ge-Sb is less realistic. In the literature, there are studies [29,[31][32][33], which support this suggestion. Considering the values of the weighting factors in Table 1, one can see that Ge-Sb bond's weighting factors ( ND,Ge-Sb =6.24% and XRD,Ge-Sb =8.49%) are lower than those for Ge-Se ( ND,Ge-Se =21.43% and XRD,Ge-Se =13.56%) and Sb-Se ( ND,Sb-Se =24.30% and XRD,Sb-Se =36.16%), which bonds have well known first neighbour distances.…”

Structure promoted electrochemical behavior and chemical stability of AgI‐doped solid electrolyte in sulfide glass system

“…The as‐prepared powder sample after the deliquescence process for different times was subjected to Raman scattering measurement for a better understanding of the influence of humidity on the network. The Raman peaks were decomposed in a series of sub‐bands for further accurate analysis by Gaussian fitting method 24,25 . Figure 9A‐C indicate that, after three days of exposure, the entire Raman peak presented a declining trend in intensity.…”

Physical and electrochemical behaviors of AgX (X = S/I) in a GeS2–Sb2S3 chalcogenide-glass matrix

“…The decreased band near 360 cm -1 can be credited to the symmetric stretching mode of edge-shared (ES) [GeS 4/2 ] tetrahedra. The increasing broad bands at 170 and 212 cm -1 were attributed to [S 2 Sb-SbS 2 ] and [Ag-S] units, respectively [13,15]. The most intense peak shifts from 308 cm -1 (x = 0.1) to 340 cm -1 at (x = 0.5) could be attributed to the influence of the added Ag 2 S on network bonding.…”

“…Afterwards, the T g remained stable at approximately 190 °C rather than changing drastically with continuous addition of AgI (0.05 ≤ y ≤ 0.2). Addition of Ag + as the network modifier may be responsible for the bond breakage of [Sb-S…S-Sb] and [Ge-S…S-Ge] chains [13]. Severe reductions in T g are frequently accompanied by reductions in the interconnections of units, which means the interconnected S bonds are largely destroyed by Ag + at high concentrations of Ag + .…”