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Mixed magnesium-aluminiun hydroxides. I. Preparation and characterization of compounds formed in dialysed systems

Published online by Cambridge University Press:  09 July 2018

M. C. Gastuche ,
G. Brown  and
M. M. Mortland
M. C. Gastuche
Affiliation:
Musée Royal de l'Afrique Centrale, Tervuren, *Faculté des Sciences Agronomiques et Institut Interfacultaire des Sciences Appliqués, Université de Louvain, Belgium
G. Brown
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts, England
M. M. Mortland
Affiliation:
Department of Soil Science, Michigan State University, East Lansing, Michigan, U.S.A.
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Abstract

The materials formed by dialysis of the precipitates formed by the reaction of NaOH with mixed Mg-Al solutions are described. In addition to aluminium and magnesium hydroxides, two hydrocarbonates having Mg/Al ratios of about 5 : 1 and 2 : 1 are formed, essentially pure, from solutions with Mg/Mg + Al molar ratios of 0.8 and 0.7, respectively. X-ray powder data shows that they have partially ordered hexagonal layer structures with unit layer dimensions a = 3.048 Å, layer thickness 7.60 Å for the Al-rich compound and a = 3.072 Å, layer thickness 7.92 Å for the Al-poor compound. X-ray and chemical data show that the new compounds resemble the minerals hydrotalcite and manasseite and also the compounds described as Mg-Al hydroxides by Feitknecht.

Type
Research Article
Information
Clay Minerals , Volume 7 , Issue 2 , December 1967 , pp. 177 - 192
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1967

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