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Physics and Chemistry of Minerals

, Volume 8, Issue 1, pp 14–19 | Cite as

Orientation and motion of water molecules in cordierite: A proton nuclear magnetic resonance study

  • Douglas G. Carson
  • George R. Rossman
  • Robert W. Vaughan
Article

Abstract

Conventional and solid state proton nuclear magnetic resonance (NMR) techniques have been used to examine water molecules in the channels of a single crystal of cordierite, (Mg, Fe)2Al4Si5O18, as a function of temperature, magnetic field, and orientation. Only one type of water was found rather than water in two distinct rigid orientations which were indicated by earlier infrared spectral studies. However, the measured dipolar splittings indicate that this water is in rapid motion. Shifts in the dipolar doublet due to Fe2+ impurities indicate that the water molecules are not moving among adjacent channel sites along a channel cavity. A two-site hopping model is proposed involving the major residence time spent with the hydrogen-hydrogen vector parallel to the channels, a minor residence time spent with the hydrogen-hydrogen vector perpendicular to the channels, and a short time (<1 μs) in transit. This model fits both the present NMR data and previously reported infrared absorption data and is compared to previously reported neutron diffraction data.

Keywords

Nuclear Magnetic Resonance Cordierite Infrared Absorption Nuclear Magnetic Resonance Data Nuclear Magnetic Resonance Study 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Boden N, Mortimer M (1973) An NMR solid echo experiment for the direct measurement of the dipolar interactions between spin-1/2 pairs in solids. Chem Phys Lett 21:538–540Google Scholar
  2. Carson DG (1981) Solid state NMR at high magnetic fields using multiple pulse technique. PhD Thesis, California Institute of Technology, Pasadena, CaliforniaGoogle Scholar
  3. Chidambaram R (1962) Structure of the hydrogen-bonded water molecule in crystals. J Chem Phys 36:2361–2365Google Scholar
  4. Cohen JP, Ross FK, Gibbs GV (1977) An X-ray and neutron diffraction study of hydrous low cordierite Am Mineral 62:67–78Google Scholar
  5. Duncan JF, Johnston JH (1974) Single-crystal 57 Fe Mössbauer studies of the site positions in cordierite. Aust J Chem 27:249–258Google Scholar
  6. El Saffar ZM (1966) Study of the NMR results in some crystalline hydrates. J Chem Phys 45:4643–4651Google Scholar
  7. Gibbs GV (1966) The polymorphism of cordierite. I: The crystal structure of low cordierite. Am Mineral 51:1068–1087Google Scholar
  8. Goldman DS, Rossman GR, Dollase WA (1977) Channel constituents in cordierite. Am Mineral 62:1144–1157Google Scholar
  9. Hochella MF Jr, Brown GE, Ross FK, Gibbs GV (1979) High temperature crystal chemistry of hydrous Mg- and Fe-cordierites. Am Mineral 64:337–351Google Scholar
  10. Holcomb DF, Pedersen B (1963) Structural interpretation of asymmetrically broadened NMR fine-structure lines. J Chem Phys 38:54–60Google Scholar
  11. Langer K, Schreyer W (1976) Apparent effects of molecular water on the lattice geometry of cordierite: A discussion. Am Mineral 61:1036–1040Google Scholar
  12. Pake GE (1948) Nuclear resonance absorption in hydrated crystals: Fine structure of the proton line. J Chem Phys 16:327–336Google Scholar
  13. Pedersen B (1964) NMR in hydrate crystals: Correction for vibrational motion. J Chem Phys 41:122–132Google Scholar
  14. Slichter CP (1978) Principles of magnetic resonance. Springer, Berlin Heidelberg New YorkGoogle Scholar
  15. Smith JV, Schreyer W (1962) Location of water and argon in cordierite. Mineral Mag 33:226–236Google Scholar
  16. Stout JH (1975) Apparent effects of molecular water on the lattice geometry of cordierite. Am Mineral 60:229–2234Google Scholar
  17. Stout JH (1976) Apparent effects of molecular water on the lattice geometry of cordierite: A reply. Am Mineral 61:1041–1044Google Scholar
  18. Tsang T, Ghose S (1972) Nuclear magnetic resonance of H and Al and Al-Si order in low cordierite, Mg2Al4Si5O18·nH2O. J Chem Phys 56:3329–3332Google Scholar
  19. Vaughan RW, Elleman DD, Stacey LM, Rhim W-K, Lee JW (1972) A simple low power, multiple pulse NMR spectrometer. Rev Sci Instrum 43:1356–1364Google Scholar
  20. Wallace JH, Wenk HR (1980) Structure variation in low cordierites. Am Mineral 65:96–111Google Scholar

Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • Douglas G. Carson
    • 1
  • George R. Rossman
    • 2
  • Robert W. Vaughan
    • 1
  1. 1.Division of Chemistry and Chemical EngineeringCalifornia Institute of TechnologyPasadenaUSA
  2. 2.Division of Geological and Planetary ScienceCalifornia Institute of TechnologyPasadenaUSA

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