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Disordering during melting: An 17O NMR Study of crystalline and glassy CaTiSiO5 (titanite)

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Published/Copyright: March 28, 2015
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American Mineralogist
From the journal American Mineralogist Volume 87 Issue 4

Abstract

Although titanite (CaTiSiO5) has one of the highest known entropies of fusion among silicates, the corresponding melt is a relatively good glass-former, which provides an opportunity to investigate the structural origin of disorder in the liquid. Here we present an 17O NMR study of CaTiSiO5 glass, using detailed new results on the crystalline phase, collected at magnetic fields of 9.4, 14.1, 18.8, and 21.1 Tesla, to interpret the spectra. We find that the glass contains significant concentrations of Si-O-Si and Si-O-Ca sites in addition to the Ti-O-Ti and Ti-O-Si sites of the crystal, suggesting considerable network disorder. Simulations of the spectra for the crystal allow the derivation of isotropic chemical shifts and quadrupolar coupling constants (CQ) for each of the five O atom sites. In addition the Ti-O-Ti site has an unusually large chemical shift anisotropy and an unusually small CQ value.

Received: 2001-9-19
Accepted: 2001-12-12
Published Online: 2015-3-28
Published in Print: 2002-4-1

© 2015 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. Titanium in biotite from metapelitic rocks: Temperature effects, crystal-chemical controls, and petrologic applications
  2. Local equilibrium in polymetamorphic gneiss and the titanium substitution in biotite
  3. The enthalpy of formation and internally consistent thermodynamic data of Mg-staurolite
  4. Coexisting andalusite, kyanite, and sillimanite: Sequential formation of three Al2SiO5 polymorphs during progressive metamorphism near the triple point, Sivrihisar, Turkey
  5. Co-existing aluminum silicates in quartz veins: A quantitative approach for determining andalusite-sillimanite equilibrium in natural samples using oxygen isotopes
  6. Stability of corundum + quartz relative to kyanite and sillimanite at high temperature and pressure
  7. Andalusite-sillimanite replacement (Mazarrón, SE Spain): A microstructural and TEM study
  8. Hydroxyl-rich topaz in high-pressure and ultrahigh-pressure kyanite quartzites, with retrograde woodhouseite, from the Sulu terrane, eastern China
  9. Coesite exsolution from supersilicic titanite in UHP marble from the Kokchetav Massif, northern Kazakhstan
  10. Composition of synthetic tremolite-tschermakite solid solutions in amphibole + anorthiteand amphibole + zoisite-bearing assemblages
  11. Paragenesis and thermobarometry of Ca-amphiboles in the Barcroft granodioritic pluton, central White Mountains, eastern California
  12. B and Li in Proterozoic metapelites from the Black Hills, U.S.A.: Implications for the origin of leucogranitic magmas
  13. The role of Fe and cation order in the crystal chemistry of surinamite, (Mg,Fe2+)3(Al,Fe3+)3O[AlBeSi3O15]: A crystal structure, Mössbauer spectroscopic, and optical spectroscopic study
  14. Fe3+ and Fe2+ partitioning among silicates in metapelites: A synchrotron micro-XANES study
  15. Thermodynamic and structural behavior of analcime–leucite analogue systems
  16. In-situ synchrotron study of the kinetics, thermodynamics, and reaction mechanisms of the hydrothermal crystallization of gyrolite, Ca16Si24O60(OH)8·14H2O
  17. The crystal structures of grossular and spessartine between 100 and 600 K and the crystal chemistry of grossular-spessartine solid solutions
  18. The structures of becquerelite and Sr-exchanged becquerelite
  19. Elasticity and equation of state of orthoenstatite, MgSiO3
  20. Reidite: An impact-produced high-pressure polymorph of zircon found in marine sediments
  21. A new polymorph of eucryptite (LiAlSiO4), ε-eucryptite, and thermal expansion of α- and ε-eucryptite at high pressure
  22. Disordering during melting: An 17O NMR Study of crystalline and glassy CaTiSiO5 (titanite)
  23. Characterization of Mn oxides in cemented streambed crusts from Pinal Creek, Arizona, U.S.A., and in hot-spring deposits from Yuno-Taki Falls, Hokkaido, Japan
https://doi.org/10.2138/am-2002-0422

Articles in the same Issue

  1. Titanium in biotite from metapelitic rocks: Temperature effects, crystal-chemical controls, and petrologic applications
  2. Local equilibrium in polymetamorphic gneiss and the titanium substitution in biotite
  3. The enthalpy of formation and internally consistent thermodynamic data of Mg-staurolite
  4. Coexisting andalusite, kyanite, and sillimanite: Sequential formation of three Al2SiO5 polymorphs during progressive metamorphism near the triple point, Sivrihisar, Turkey
  5. Co-existing aluminum silicates in quartz veins: A quantitative approach for determining andalusite-sillimanite equilibrium in natural samples using oxygen isotopes
  6. Stability of corundum + quartz relative to kyanite and sillimanite at high temperature and pressure
  7. Andalusite-sillimanite replacement (Mazarrón, SE Spain): A microstructural and TEM study
  8. Hydroxyl-rich topaz in high-pressure and ultrahigh-pressure kyanite quartzites, with retrograde woodhouseite, from the Sulu terrane, eastern China
  9. Coesite exsolution from supersilicic titanite in UHP marble from the Kokchetav Massif, northern Kazakhstan
  10. Composition of synthetic tremolite-tschermakite solid solutions in amphibole + anorthiteand amphibole + zoisite-bearing assemblages
  11. Paragenesis and thermobarometry of Ca-amphiboles in the Barcroft granodioritic pluton, central White Mountains, eastern California
  12. B and Li in Proterozoic metapelites from the Black Hills, U.S.A.: Implications for the origin of leucogranitic magmas
  13. The role of Fe and cation order in the crystal chemistry of surinamite, (Mg,Fe2+)3(Al,Fe3+)3O[AlBeSi3O15]: A crystal structure, Mössbauer spectroscopic, and optical spectroscopic study
  14. Fe3+ and Fe2+ partitioning among silicates in metapelites: A synchrotron micro-XANES study
  15. Thermodynamic and structural behavior of analcime–leucite analogue systems
  16. In-situ synchrotron study of the kinetics, thermodynamics, and reaction mechanisms of the hydrothermal crystallization of gyrolite, Ca16Si24O60(OH)8·14H2O
  17. The crystal structures of grossular and spessartine between 100 and 600 K and the crystal chemistry of grossular-spessartine solid solutions
  18. The structures of becquerelite and Sr-exchanged becquerelite
  19. Elasticity and equation of state of orthoenstatite, MgSiO3
  20. Reidite: An impact-produced high-pressure polymorph of zircon found in marine sediments
  21. A new polymorph of eucryptite (LiAlSiO4), ε-eucryptite, and thermal expansion of α- and ε-eucryptite at high pressure
  22. Disordering during melting: An 17O NMR Study of crystalline and glassy CaTiSiO5 (titanite)
  23. Characterization of Mn oxides in cemented streambed crusts from Pinal Creek, Arizona, U.S.A., and in hot-spring deposits from Yuno-Taki Falls, Hokkaido, Japan
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