Investigating cerium redox changes between aluminosilicate glass and melt, a multispectroscopic approach
Etude des changements de l’oxydoréduction du cérium entre le verre aluminosilicate et la fonte, une approche multispectroscopique
Résumé
Redox control of glasses is paramount to both their fusion process and to obtain the desired properties of high technological glasses. However, the link between melting parameters such as temperature, furnace atmosphere or quenching rate and the redox state of the final products is poorly understood. In this work, in situ XANES data at Ce L3-edge data were acquired at high temperature on cerium containing sodium aluminosilicate glasses, allowing the determination of thermodynamic constants necessary to predict cerium redox state over a wide temperature range (900°C-1500°C). The results obtained were compared to Raman spectra of samples quenched from different temperatures. Our findings demonstrate that the quench performed was fast enough to block cerium oxidation state, meaning the redox measured at room temperature is representative of a high temperature state. This was further verified by room temperature Raman spectroscopy where a relationship was found between the spectra and melting conditions. Wet chemical analysis, XANES at Ce L3-edge, Raman spectroscopy and optical absorption spectroscopy were successfully used to determine redox state of cerium in aluminosilicates.
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