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Chemical Characterization, Structural Features, and Thermal Behavior of Sodium and Hydrogen Octosilicate

Published online by Cambridge University Press:  02 April 2024

G. Borbély ,
H. K. Beyer ,
H. G. Karge ,
W. Schwieger ,
A. Brandt  and
K.-H. Bergk
G. Borbély
Affiliation:
Central Research Institute of Chemistry of the Hungarian, Academy of Sciences, Budapest, Hungary
H. K. Beyer
Affiliation:
Central Research Institute of Chemistry of the Hungarian, Academy of Sciences, Budapest, Hungary
H. G. Karge
Affiliation:
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany
W. Schwieger
Affiliation:
Sektion Chemie, WB Technische Chemie, Martin-Luther-Universität, Halle, Germany
A. Brandt
Affiliation:
Sektion Chemie, WB Technische Chemie, Martin-Luther-Universität, Halle, Germany
K.-H. Bergk
Affiliation:
Sektion Chemie, WB Technische Chemie, Martin-Luther-Universität, Halle, Germany
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Abstract

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The chemical composition and the thermal behavior of sodium and hydrogen octosilicate was studied by chemical and thermal analysis, infrared (IR), magic-angle-spinning nuclear magnetic resonance (MAS-NMR) spectroscopy, and X-ray diffractometry. Both compounds are layer silicates with basal spacings of 11.10 and 7.38 Å, respectively. In both forms the ratio of Q4 silicon (connected via oxygen bridges with four silicon atoms) to Q3 silicon (connected with only three other Si atoms) is 1. At least a small part of the Q4 silicon can be substituted by aluminum. Elimination of water coordinated to the cations in sodium octosilicate results in a concomitant structural collapse. Replacement of the sodium ions by protons affects the atomic arrangement in the sheets only to a minor degree, but results in a decrease of the periodicity along the crystallographic c axis. Upon heat treatment an endothermal structural rearrangement occurs at about 360 K as revealed by significant changes of the IR and 29Si MAS-NMR spectra. Reexchange with Na ions largely, but not completely, restores the structure of the parent octosilicate.

The X-ray diffraction pattern of sodium octosilicate was indexed in the monoclinic system with a = 7.345 Å, b = 12.74 Å, c = 11.25 Å and β = 99.3°. Based on conclusions drawn from the results of the present study, the X-ray pattern of hydrogen octosilicate was tentatively indexed in the monoclinic system with a = 7.345 Å, b = 12.74 Å, c = 8.51 Å and β = 119.8°.

Keywords

OctosilicateSheet silicatesMAS-NMR spectroscopyThermal behavior
Type
Research Article
Information
Clays and Clay Minerals , Volume 39 , Issue 5 , October 1991 , pp. 490 - 497
Copyright
Copyright © 1991, The Clay Minerals Society

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