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The montmorillonite differential thermal curve. II. Effect of exchangeable cations on the dehydroxylation of normal montmorillonite

Published online by Cambridge University Press:  14 March 2018

R. C. Mackenzie  and
B. M. Bishui
R. C. Mackenzie
Affiliation:
The Macaulay Institute for Soil Research, Aberdeen
B. M. Bishui
Affiliation:
The Macaulay Institute for Soil Research, Aberdeen
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Abstract

Examination of the differential thermal characteristics of a normal montmorillonite saturated with a series of monovalent and divalent cations shows that the temperature of the main dehydroxylation peak is independent of valency but is apparently a parabolic function of ionic radius. NH4+, Cs+, Zn2+ and Cd2+ give anomalous results, but the apparent discrepancy of the former two ions can be fully accounted for. The results are believed to be consistent with evolution of water molecules through the hexagonal holes in the sheet surface and diffusion between the layers to the micelle edge. The significance of variation in the 800–1000°C region of the curve is briefly considered.

Type
Research Article
Information
Clay Minerals Bulletin , Volume 3 , Issue 20 , December 1958 , pp. 276 - 286
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1958

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