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Identification of individual phases in the system magnesium oxide-silicon dioxide-water under hydrothermal conditions

J. Petrovič and M. Pisarčík

Institut für Anorganische Chemie der Slowakischen Akademie der Wissenschaften, 809 34 Bratislava


Abstract:  Mixtures of MgO and SiO2 (Aerosil Degussa 99.3% SÍO2) have been studied by means of infrared absorption spectroscopy and DTA under hydrothermal conditions. Temperatures and times were chosen in such a way that should allow to observe the single phases of the initial stage of the reactions at the formation of talcum and serpentine. It has been found possible to identify by infrared absorption spectroscopy three components only, viz., the magnesium- rich component, existing in the presence of still free brucite, talcum and serpentine. The magnesium-rich substance as the first step of reaction between MgO and SiO2, reacts in the presence of water with some more SÍO2 under the formation of talcum, or it possibly crystallizes as serpentine without changing its composition.

Full paper in Portable Document Format: 273a336.pdf (in German)


Chemical Papers 27 (3) 336–339 (1973)

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