Raman Spectroscopy and Statistical Analysis of the Silicate Species and Group Connectivity in Cesium Silicate Glass Forming System
Year: 2015
Type: article
Abstract: The Raman spectra of x %Cs2O-(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 the Qn 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 with x>17 mol% can be described by disproportionation reaction Q3⇔Q4+Q2 . The enthalpy of this reaction was found to be equal to 32 ± 6, 43 ± 8, 56 ± 10, and 52 ± 9 for x=22 , 27, 33, and 37 mol%, respectively. The nonideal entropy of mixing (Δ Smix ) depends on the melt temperature and increases almost linearly with increasing temperature. The Qn , Q2–Q2 , and Qn,ijkl distributions with x ranging from 0 to 55 mol% were modeled using experimental data for the concentrations of the Qn units.
DOI: 10.1155/2015/572840
Institution: Institute of Mineralogy
Language: English
Subfield: Ceramics and Composites
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Award: G5068289673
OpenAlex ID: W2158024753