Abstract
HYDROTHERMAL treatment of mixtures of γ-Ca2SiO4 and quartz has yielded a new compound of probable composition Ca8Si5O18, or 8CaO.5SiO2. This is formed, together with other products, over a wide range of conditions (bulk CaO : SiO2 molar ratio 1.5–2.0, temperature 180°–600° C, pressure 10–200 bars, time 3–14 days). It has not yet been obtained in a pure form, but a preparation containing it with only small proportions of γ-Ca2SiO4 and wollaston-ite was obtained by treating a mixture of bulk CaO : SiO2 ratio 1.75 for 14 days at 600° C and 200 bars.
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BENNETT, J., GARD, J., SPEAKMAN, K. et al. Ca8Si5O18 and the Nature of “γ-Dicalcium Silicate Hydrate”. Nature 209, 1127 (1966). https://doi.org/10.1038/2091127a0
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DOI: https://doi.org/10.1038/2091127a0
