Abstract
Cerium is exploited as a probe cation for elucidating the structure of an alkoxide-derived silica gel and its progressive evolution to a glass network as a function of heat-treatment up to 1000°C. At intermediate temperatures, the host structure exhibits inhomogeneity due to insufficient formation of siloxane bonds, which is reflected by at least two different sites and co-ordination spheres (termed “high” and “low” water ligation) for cerium. This is proved by the response of the gels heated up to 700°C to rehydration. Further formation of Si−O−Si network (900°C) leads to the destruction of the “high water” sites of cerium and progression towards a glassy structure. It is, however, only after heat-treatment at 1000°C that a dense silica glass network, not responding to rehydration, is finally obtained with cerium ions embedded in it.
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Patra, A., Kundu, D. & Ganguli, D. Spectroscopic study of cerium-doped silica gel monoliths and their densified derivatives. J Sol-Gel Sci Technol 9, 65–69 (1997). https://doi.org/10.1007/BF02439337
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DOI: https://doi.org/10.1007/BF02439337