Abstract
The crystallization of bulk amorphous SiO2 samples, prepared by the sol-gel method, was obtained by heat treatments in air at temperatures as low as 500 °C. This occurs when silver is added to the precursor solutions in an amount such that it forms aggregates embedded in the glass. Another requirement to observe the low-temperature glass crystallization is that the bulk samples must be prepared from precursor solutions with specific compositions. These compositions, have a high H2O/TEOS ratio, which produces an amorphous SiO2 structure with some structural similarities to cristobalite, the phase in which the SiO2 glass crystallizes.
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Garníca-Romo, M.G., González-Hernández, J., Hernández-Landaverde, M.A. et al. Structure of heat-treated sol-gel SiO2 glasses containing silver. Journal of Materials Research 16, 2007–2012 (2001). https://doi.org/10.1557/JMR.2001.0275
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DOI: https://doi.org/10.1557/JMR.2001.0275