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Infrared Study of the Thermal Decomposition of Ammonium Rectorite

  • Symposium on Surface Reactivity
  • Published:
Clays and Clay Minerals

Abstract

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.

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Authors and Affiliations

  1. Department of Agronomy, Purdue University, Lafayette, Indiana, USA

    J. D. Russell & J. L. White

Authors
  1. J. D. Russell
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  2. J. L. White
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Additional information

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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Russell, J.D., White, J.L. Infrared Study of the Thermal Decomposition of Ammonium Rectorite. Clays Clay Miner. 14, 181–191 (1966). https://doi.org/10.1346/CCMN.1966.0140115

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  • DOI: https://doi.org/10.1346/CCMN.1966.0140115

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