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Infrared Study of the Thermal Decomposition of Ammonium Rectorite

Published online by Cambridge University Press:  01 July 2024

J. D. Russell  and
J. L. White
J. D. Russell
Affiliation:
Department of Agronomy, Purdue University, Lafayette, Indiana
J. L. White
Affiliation:
Department of Agronomy, Purdue University, Lafayette, Indiana
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Abstract

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Changes in the infrared absorption spectrum of ammonium-saturated rectorite on heating suggest that the ammonium cations are hydrogen bonded to water molecules when the mineral is hydrated. Further spectral changes above 300°C indicate that lattice OH groups are perturbed by protons liberated from the decomposition of ammonium ions giving rise to an absorption doublet at 3500 and 3476 cm-1. The doublet attains maximal intensity when decomposition of ammonium cations and dehydroxylation of the mineral is complete at about 550°C.

The perturbation effect occurs only for swelling dioctahedral minerals which derive their layer charge from Al-for-Si substitution.

Type
Research Article
Information
Clays and Clay Minerals , Volume 14 , February 1966 , pp. 181 - 191
Copyright
Copyright © Clay Minerals Society 1966

Footnotes

*

This report is journal paper No. 2618 of the Purdue University Agricultural Experimental Station, Lafayette, Indiana.

†

On leave of absence from the Macaulay Institute for Soil Research, Aberdeen, Scotland.

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