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

  • J. F. Stebbins EMAIL logo , J. V. Oglesby und S. Kroeker
Veröffentlicht/Copyright: 26. März 2015
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 86 Heft 10

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.

Received: 2001-3-30
Accepted: 2001-6-11
Published Online: 2015-3-26
Published in Print: 2001-10-1

© 2015 by Walter de Gruyter Berlin/Boston

Artikel in diesem Heft

  1. Recalibration of the GASP geobarometer in light of recent garnet and plagioclase activity models and versions of the garnet-biotite geothermometer
  2. Compositional zoning and element partitioning in nickeloan tourmaline from a metamorphosed karstbauxite from Samos, Greece
  3. Occurrence of apatite associated with magnetite in an ophiolite complex (Othrys), Greece
  4. Overpressures induced by coesite-quartz transition in zircon
  5. Geochemical modeling of bacterially induced mineralization of schwertmannite and jarosite in sulfuric acid spring water
  6. H2O-D2O exchange in lawsonite
  7. Composition and temperature dependence of cation ordering in Ni-Mg olivine solid solutions: a time-of-flight neutron powder diffraction and EXAFS study
  8. Thermal conductivity of spinels and olivines from vibrational spectroscopy: Ambient conditions
  9. Elasticity of six polycrystalline silicate garnets at pressure up to 3.0 GPa
  10. The crystal chemistry of birefringent natural uvarovites: Part I. Optical investigations and UV-VIS-IR absorption spectroscopy
  11. The crystal chemistry of birefringent natural uvarovites: Part II. Single-crystal X-ray structures
  12. Ferroanthophyllite in Rockport grunerite: A transmission electron microscopy study
  13. Crystal structure of a new (21)-clinopyribole synthesized at high temperature and pressure
  14. The Mg(Fe)SiO3 orthoenstatite-clinoenstatite transitions at high pressures and temperatures determined by Raman-spectroscopy on quenched samples
  15. Raman spectroscopic studies of phase E to 19 GPa
  16. The crystal structures of the low-temperature phases of leonite-type compounds, K2Me(SO4)2·4H2O (Me2+ = Mg, Mn, Fe)
  17. Carraraite and zaccagnaite, two new minerals from the Carrara marble quarries: their chemical compositions, physical properties, and structural features
  18. Pristine surface growth features on 100 Ma garnet phenocrysts: Interference imaging results
  19. Oxygen triclusters in crystalline CaAl4O7 (grossite) and in calcium aluminosilicate glasses: 17O NMR
  20. Low-temperature heat capacity of pentlandite
  21. Calcium segregation at antiphase boundaries in pigeonite
https://doi.org/10.2138/am-2001-1019

Artikel in diesem Heft

  1. Recalibration of the GASP geobarometer in light of recent garnet and plagioclase activity models and versions of the garnet-biotite geothermometer
  2. Compositional zoning and element partitioning in nickeloan tourmaline from a metamorphosed karstbauxite from Samos, Greece
  3. Occurrence of apatite associated with magnetite in an ophiolite complex (Othrys), Greece
  4. Overpressures induced by coesite-quartz transition in zircon
  5. Geochemical modeling of bacterially induced mineralization of schwertmannite and jarosite in sulfuric acid spring water
  6. H2O-D2O exchange in lawsonite
  7. Composition and temperature dependence of cation ordering in Ni-Mg olivine solid solutions: a time-of-flight neutron powder diffraction and EXAFS study
  8. Thermal conductivity of spinels and olivines from vibrational spectroscopy: Ambient conditions
  9. Elasticity of six polycrystalline silicate garnets at pressure up to 3.0 GPa
  10. The crystal chemistry of birefringent natural uvarovites: Part I. Optical investigations and UV-VIS-IR absorption spectroscopy
  11. The crystal chemistry of birefringent natural uvarovites: Part II. Single-crystal X-ray structures
  12. Ferroanthophyllite in Rockport grunerite: A transmission electron microscopy study
  13. Crystal structure of a new (21)-clinopyribole synthesized at high temperature and pressure
  14. The Mg(Fe)SiO3 orthoenstatite-clinoenstatite transitions at high pressures and temperatures determined by Raman-spectroscopy on quenched samples
  15. Raman spectroscopic studies of phase E to 19 GPa
  16. The crystal structures of the low-temperature phases of leonite-type compounds, K2Me(SO4)2·4H2O (Me2+ = Mg, Mn, Fe)
  17. Carraraite and zaccagnaite, two new minerals from the Carrara marble quarries: their chemical compositions, physical properties, and structural features
  18. Pristine surface growth features on 100 Ma garnet phenocrysts: Interference imaging results
  19. Oxygen triclusters in crystalline CaAl4O7 (grossite) and in calcium aluminosilicate glasses: 17O NMR
  20. Low-temperature heat capacity of pentlandite
  21. Calcium segregation at antiphase boundaries in pigeonite
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