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Formation of synthetic analogues of double metal-hydroxy carbonate minerals under controlled pH conditions: II. The synthesis of desautelsite

Published online by Cambridge University Press:  09 July 2018

H. C. B. Hansen  and
R. M. Taylor
H. C. B. Hansen
Affiliation:
Royal Veterinary and Agricultural University, Chemistry Department, Thorvaldensvej 40, 1871 Copenhagen V, Denmark
R. M. Taylor
Affiliation:
CSIRO Division of Soils, Private Bag 2, Glen Osmond, 5064 South Australia
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Abstract

Desautelsite, a Mg(II)Mn(III) hydroxy carbonate first described in 1979 and represented by the general formula Mg(8−x)Mn(III)x(OH)16(CO3)x/2 (in which 2 < x < 2·67), has been synthesized under controlled pH conditions (induced hydrolysis) and coprecipitation techniques. In the pH-stat syntheses, the desautelsite is formed by aerial oxidation of MnCO3 in 0·05–0·15 m Mg(NO3)2 solutions at ∼pH 9 and temperatures of 35°C where, in the absence of Mg, manganite would normally form. The synthesis product from this technique is generally more crystalline than that formed by the coprecipitation method. Composition, particle shape and aggregation may be controlled through variations of the Mg concentration, pH, aeration rate or temperature. Indirect evidence suggests Mn to be present in the +3 oxidation state in the desautelsite.

Type
Research Article
Information
Clay Minerals , Volume 26 , Issue 4 , December 1991 , pp. 507 - 525
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1991

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