TY - JOUR
T1 - A synthetic Na-rich mica
T2 - Synthesis and characterization by 27Al and 29Si magic angle spinning nuclear magnetic resonance spectroscopy
AU - Komarneni, Sridhar
AU - Pidugu, Rajyalakshmi
AU - Hoffbauer, W.
AU - Schneider, Hartmut
N1 - Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 1999
Y1 - 1999
N2 - 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 27Al 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.
AB - 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 27Al 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.
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U2 - 10.1346/CCMN.1999.0470403
DO - 10.1346/CCMN.1999.0470403
M3 - Article
AN - SCOPUS:0032729010
SN - 0009-8604
VL - 47
SP - 410
EP - 416
JO - Clays and Clay Minerals
JF - Clays and Clay Minerals
IS - 4
ER -