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The Interlayer Collapse During Dehydration of Synthetic Na0.7-Beidellite: A 23Na Solid-State Magic-Angle Spinning NMR Study

Published online by Cambridge University Press:  28 February 2024

J. Theo Kloprogge ,
J. Ben H. Jansen ,
Roelof D. Schuiling  and
John W. Geus
J. Theo Kloprogge
Affiliation:
Department of Geochemistry, Institute for Earth Sciences, University of Utrecht, Budapestlaan 4, P.O. Box 80.021, 3508 TA Utrecht, The Netherlands
J. Ben H. Jansen
Affiliation:
Department of Geochemistry, Institute for Earth Sciences, University of Utrecht, Budapestlaan 4, P.O. Box 80.021, 3508 TA Utrecht, The Netherlands
Roelof D. Schuiling
Affiliation:
Department of Geochemistry, Institute for Earth Sciences, University of Utrecht, Budapestlaan 4, P.O. Box 80.021, 3508 TA Utrecht, The Netherlands
John W. Geus
Affiliation:
Department of Inorganic Chemistry, University of Utrecht, P.O. Box 80083, 3508 TB, Utrecht, The Netherlands
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Abstract

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The dehydration and migration of the interlayer cation of the synthetic beidellite Na0.7Al4.7Si7.3O20-(OH)4·nH2O, were studied with solid-state 23Na and 27Al MAS-NMR, heating stage XRD, and thermogravimetric analyses (TGA, DTA). The 23Na MAS-NMR of Na-beidellite at 25°C displays a chemical shift of 0.2 ppm, which indicates a configuration comparable with that of Na+ in solution. Total dehydration proceeds reversibly in two temperature ranges. Four water molecules per Na+ are gradually removed from 25° to 85°C. As a result, the basal spacing decreases from 12.54 Å to 9.98 Å and the Na+ surrounded by the two remaining water molecules is relocated in the hexagonal cavities of the tetrahedral sheet. The chemical shift of 1.5 ppm exhibited after the first dehydration stage illustrates the increased influence of the tetrahedral sheet. The high local symmetry is maintained throughout the entire first dehydration stage. During the second dehydration, which proceeds in a narrow temperature range around 400°C, the remaining two water molecules are removed reversibly without any change of the basal spacing.

Keywords

BeidelliteDehydrationInterlayer collapse23Na MAS-NMR
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 5 , October 1992 , pp. 561 - 566
Copyright
Copyright © 1992, The Clay Minerals Society

Footnotes

Publication of the Debye Institute, University of Utrecht, The Netherlands.

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