Raman Spectroscopy and Statistical Analysis of the Silicate Species and Group Connectivity in Cesium Silicate Glass Forming System. (18th October 2015)

• Record Type: Journal Article
• Authors: Osipov, Armenak; Osipova, Leyla; Zainullina, Rimma
• Other Names: Riesen Hans Academic Editor.
• Is Part Of: International journal of spectroscopy. Volume 2015(2015)
• Publication Date: 2015-10-18
• Subjects: Spectrum analysis -- Periodicals; Spectrum Analysis; Spectrum analysis; Periodicals; Periodicals; 543.5
• DOI: 10.1155/2015/572840
• Languages: English
• ISSNs: 1687-9449

Abstract

Abstract : The Raman spectra ofx %Cs2 O-(100 − x )%SiO2 (x = 17, 22, 27, 33, and 37 mol%) glasses and melts were measured in the temperature range of 293 to 1553 K. The concentrations of theQ n species were calculated as a function of the composition and temperature based on the deconvolution analysis of the spectra. It was found that a dynamic equilibrium among structural units in the melts withx > 17 mol% can be described by disproportionation reactionQ 3 ⇔ Q 4 + Q 2 . The enthalpy of this reaction was found to be equal to 32 ± 6, 43 ± 8, 56 ± 10, and 52 ± 9 forx = 22, 27, 33, and 37 mol%, respectively. The nonideal entropy of mixing (ΔS mix ) depends on the melt temperature and increases almost linearly with increasing temperature. TheQ n, Q 2 – Q 2, andQ n, i j k l distributions withx ranging from 0 to 55 mol% were modeled using experimental data for the concentrations of theQ n units.