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A Synthetic Na-Rich Mica: Synthesis and Characterization by 27Al and 29Si Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy

Published online by Cambridge University Press:  28 February 2024

Sridhar Komarneni ,
Rajyalakshmi Pidugu ,
W. Hoffbauer  and
Hartmut Schneider
Sridhar Komarneni
Affiliation:
Department of Agronomy and Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
Rajyalakshmi Pidugu
Affiliation:
Department of Agronomy and Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
W. Hoffbauer
Affiliation:
Institute of Inorganic Chemistry, University of Bonn, D-53121 Bonn, Germany
Hartmut Schneider
Affiliation:
Ceramic Department, Institute of Materials Research, German Aerospace Research Establishment-DLR, D-51170, Koln, Germany
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Abstract

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A swelling mica, Na2Mg3(Al2Si2)O10F2·xH2O, (hereafter “Na-4 mica”) was synthesized from metakaolinite + MgO and Mg aluminosilicate gels at different temperatures and durations using NaF flux. The various samples were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and 27A1 and 29Si magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. The results showed that phase-pure Na-4 mica was obtained from metakaolinite which serves as a cost-effective aluminosilicate source. 27Al MAS NMR spectra showed that all or nearly all Al is in tetrahedral coordination whereas 29Si MAS NMR spectra showed that the nearest neighbor environment of Si is mainly Si(3Al), as expected based on the Si:Al ratio.

Keywords

KGa-1MAS NMR SpectroscopyMetakaoliniteMicaNa MicaSynthetic Clay Mineral
Type
Research Article
Information
Clays and Clay Minerals , Volume 47 , Issue 4 , August 1999 , pp. 410 - 416
Copyright
Copyright © 1999, The Clay Minerals Society

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