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Isomorphous Substitution of Aluminium for Silicon in Tobermoritic Structure. I. The Mixtures of Different Forms of Silicon Dioxide and of Different Compounds of Aluminium

J. Petrovič, V. Rusnák, and L. Števula

Institute of Inorganic Chemistry, Slovak Academy of Sciences, Bratislava 9

 

Abstract: The isomorphous substitution of Al(III) for Si(IV) in the tobermoritic structure was studied by using x-ray phase anal. and D.T.A. The extent of substitution depends on the different forms of SiO2 and on the different compds. of Al used. β-Quartz, quartz-glass, and silica gel as a source of SiO2 and gibbsite (Al(OH)3, reagent grade), boehmite (gibbsite heated at 300° for 7 days), kaolinite (from Sedlec), dehydrated kaolinite (700° for 2 hr.), corundum (gibbsite calcined at 1200° for 3 hrs.), and γ-Al2O3 (gibbsite calcined for 2 hr.) as a source of Al were used in the mixts. The mixts. were heated in an autoclave at 150, 180, and 200° for 10, 24, and in some cases for 48 hrs.

Full paper in Portable Document Format: 232a129.pdf

 

Chemical Papers 23 (2) 129–133 (1969)

Wednesday, July 08, 2020

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