Reactions of calcium silicates in solution in liquid calcium fluoride
- 1 January 1967
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Transactions of the Faraday Society
- Vol. 63, 1408-1417
- https://doi.org/10.1039/tf9676301408
Abstract
The system CaO+SiO2 has been studied at 1420°C in the composition range 0.1 M CaSi2O5+0.9 M CaF2 to 0.1 M Ca3SiO5+0.9 M CaF2, through the infra-red spectra of quenched thin films and by transpiration measurements of the SiF4 pressure developed over the solutions. Thermochemical results suggest a fluorination of the silicate ions, in 0.1 M CaSi2O5,+0.9 M CaF5, decreasing at higher oxide concentrations. Spectroscopic results show that the ions in quenched solutions are closely similar to those in crystalline silicates, and that meta-silicate ions exist as chain-ions rather than rings. It is suggested that fluoro-silicate ions would be unstable on quenching, and would therefore be present in insufficient concentration to give rise to Si—F bands identifiable in the infra-red spectra of quenched solutions.Keywords
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