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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

CiteScore 2017: 2.31

SCImago Journal Rank (SJR) 2017: 1.440
Source Normalized Impact per Paper (SNIP) 2017: 1.059

Online
ISSN
1945-3027
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Volume 86, Issue 10

Issues

Oxygen triclusters in crystalline CaAl4O7 (grossite) and in calcium aluminosilicate glasses: 17O NMR

J. F. Stebbins / J. V. Oglesby
  • Department of Geological and Environmental Sciences, Stanford University, Stanford California 94305-2115, U.S.A.
  • AMD, One AMD Place, P.O. Box 3453, MS 117, Sunnyvale, CA 94088
  • Other articles by this author:
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/ S. Kroeker
  • Department of Geological and Environmental Sciences, Stanford University, Stanford California 94305-2115, U.S.A.
  • Dept. of Chemistry, University of Manitoba, 350 Parker Building, Winnipeg, MB, R3TN2, Canada
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Published Online: 2015-03-26 | DOI: https://doi.org/10.2138/am-2001-1019

Abstract

We present 17O MAS NMR data for crystalline calcium dialuminate (grossite), CaAl2O4 and monoaluminate, CaAl4O7. The first of these contains an oxygen tricluster site and serves as a model compound for sites of this type in aluminosilicate glasses. Tricluster site NMR parameters are distinct from those of bridging O atoms (Al-O-Al), allowing partial resolution in triple quantum MAS NMR spectra. Such spectra for calcium aluminosilicate glasses are consistent with the presence of a small fraction of tricluster sites. Observed chemical shifts for non-bridging oxygen (NBO) atoms in an impurity phase in the CaAl2O4 sample are distinct from those for NBO in Ca-aluminosilicate glasses, indicating that the latter are primarily bonded to Si, not Al.

About the article

Received: 2001-03-30

Accepted: 2001-06-11

Published Online: 2015-03-26

Published in Print: 2001-10-01


Citation Information: American Mineralogist, Volume 86, Issue 10, Pages 1307–1311, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2001-1019.

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© 2015 by Walter de Gruyter Berlin/Boston.

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