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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 466 (1980), S. 55-70 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Structure of Ill-crystallized Calcium Hydrogen Silicates. I. Formation and Properties of an Ill-crystallized Calcium Hydrogen Disilicate PhaseInvestigations on ill-crystallized calcium hydrogen silicates (C—S—H phases) prepared by precipitation from sodium silicate solutions with calcium chloride have shown that at temperatures 0°C primarily hydrogen silicates with such an anion composition will be formed, which had been present before in the sodium silicate solution. They are not stable. On storing the precipitate in the mother liquid at 0°C they are converted into disilicate with a composition of 1.1-1.5 CaO/SiO2, if the concentration of Ca(OH)2 is more than 0.8 g/l.After drying the thermally very instable solid at -10°C the calcium hydrogen disilicate phase can be isolated.A structure proposal for this phase is given.
    Notes: Durch Fällungsreaktion aus Natriumsilicatlösungen mit Calciumsalzen entstehen bei 0°C schlecht geordnete Calciumhydrogensilicate, deren Anionenaufbau primär dem des Natriumsilicates in der Lösung entspricht. Sie sind aber nicht stabil und werden in der Mutterlauge bei 0°C in Disilicat mit einer Zusammensetzung von 1,1-1,5 CaO/SiO2 umgewandelt, wenn die Konzentration an Ca(OH)2 mehr als 0,8 g/l beträgt. Nach Trocknung der thermisch sehr instabilen Bodenkörper bei-10°C kann die Disilicatphase isoliert werden.Ein Strukturvorschlag für diese Phase wird vorgestellt.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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