ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 33, (3) 203 - 214 (1989)


CRYSTALLOCHEMISTRY AND STABILITY OF MONOSULPHOALUMINATE AND ALUMINOFERRITE HYDRATES AND THEIR SOLID SOLUTIONS
 
Hanic František, Kaprálik Ivan, Drábik Milan
 
Institute of Inorganic Chemistry of the Centre of Chemical Research, Slovak Academy of Sciences, Dúbravská cesta 5, 842 36 Bratislava

Study of the hydrates C₃A.CS.Hx, C₃A.1/2CS.1/2CH.Hx, C₃A.CH.Hx and C₃(A,F).(CS)y.(CH)1-y. Hx showed that the H₂O content as well as the stability of the hydrates are associated with their laminar structure. According to an accepted model, the compounds consist of cationic, anionic and neutral layers. The Al-Fe substitution in the cationic layer does not affect its thickness, and both the composition and thickness of the anionic layer are variable. Dehydration of each of the hydrates starts in the neutral layer. Under suitable conditions (temperature, relative humidity, reaction time), the dehydration and rehydration processes are reversible, unless the value of x falls below 6, when destruction of the structure occurs. Hydrates with x = 12 are stabilized by the presence of alternating cationic and anionic layers. Experimental results have proved that the values of basal diffractions d000l of the hydrates depend on parameters x and y.


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