Structure and Optical Conductivity of Silver Thiogermanate Glasses

✍ Scribed by E.I. Kamitsos; J.A. Kapoutsis; G.D. Chryssikos; G. Taillades; A. Pradel; M. Ribes

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 329 KB
• Volume: 112
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1994.1301

✦ Synopsis

Silver thiogermanate glasses (x \mathrm{AgI} \cdot(1-x)\left{y \mathrm{Ag}{2} \mathrm{~S} \cdot(1-y) \mathrm{GeS}{2}\right]) were investigated by infrared reflectance and Raman spectroscopies to study the glass structure as a function of (\mathrm{Ag}{2} \mathrm{~S}(0 \leq y \leq 0.5)) and (\mathrm{AgI}(y=0.5,0 \leq x \leq 0.375)) content. The results for binary glasses indicate that addition of (\mathrm{Ag}{2} \mathrm{~S}) to (\mathrm{GeS}_{2}) glass induces the depolymerization of the thiogermanate network by creation of terminal (\mathrm{Ge}-\mathrm{S}^{-})bonds. AgI was also found to affect the network structure and this was expressed by disproportionation reactions. The interactions between (\mathrm{Ag}^{+})ions and their sites were also investigated and discussed in relation to the high ionic conductivity of these glasses. Broad range conductivity spectra were also obtained by combining dielectric and far-infrared conductivity data. O 1994 Academic Press, Inc.