A synthetic Na-rich mica

Synthesis and characterization by 27Al and 29Si magic angle spinning nuclear magnetic resonance spectroscopy

Sridhar Komarneni, Rajyalakshmi Pidugu, W. Hoffbauer, Hartmut Schneider

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)410-416
Number of pages7
JournalClays and Clay Minerals
Volume47
Issue number4
DOIs
StatePublished - Jan 1 1999

Fingerprint

mica
Magic angle spinning
spinning
Nuclear magnetic resonance spectroscopy
nuclear magnetic resonance
nuclear magnetic resonance spectroscopy
spectroscopy
aluminosilicate
synthesis
Nuclear magnetic resonance
X-ray diffraction
X ray powder diffraction
swelling
Swelling
powders
scanning electron microscopy
gel
Gels
gels
Fluxes

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)

Cite this

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abstract = "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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A synthetic Na-rich mica : Synthesis and characterization by 27Al and 29Si magic angle spinning nuclear magnetic resonance spectroscopy. / Komarneni, Sridhar; Pidugu, Rajyalakshmi; Hoffbauer, W.; Schneider, Hartmut.

In: Clays and Clay Minerals, Vol. 47, No. 4, 01.01.1999, p. 410-416.

Research output: Contribution to journalArticle

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

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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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