Quantitative Raman spectroscopy: speciation of cesium silicate glasses

• Published in: Journal of Raman spectroscopy Vol. 40; no. 12; pp. 1895 - 1901
• Main Author: Malfait, Wim J.
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.12.2009
• Subjects: Cesium; Chemical equilibrium; Glass; Inverse; Melts; optimization algorithm; Raman spectroscopy; silicate glasses; Silicates; Speciation
• ISSN: 0377-0486; 1097-4555
• DOI: 10.1002/jrs.2338

The silicate speciation forms an important aspect of the structure of silicate melts, a subject of interest to both the earth‐ and materials science communities. In this study, the Qn speciation of binary cesium silicate glasses was studied by Raman spectroscopy. A method to extract the equilibrium constant from a set of Raman spectra is presented, and the least‐squares optimization algorithm is given (in Supporting Information). Log(K), the equilibrium constant of the speciation reaction, 2Q3 = Q4 + Q2, equals −2.72 ± 0.11 at the glass transition. This extends the previously established correlation between log(K) and the inverse of the ionic radius of the network modifier to cesium. Copyright © 2009 John Wiley & Sons, Ltd. The Qn speciation of binary cesium silicate glasses was studied by Raman spectroscopy. A method to extract the equilibrium constant from a set of Raman spectra is presented and the algorithm is given (Supplementary Information).