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  • 1985-1989  (1)
  • 1970-1974  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Nuclear magnetic resonance of 7Li and 23Na in zektzerite, NaLiZrSi6O15 (1989)
    Springer
    Physics and chemistry of minerals 16 (1989), S. 720-724 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract The electric field gradient (EFG) tensors of 7Li and 23Na in a zektzerite, NaLiZrSi6O15 single crystal have been determined by the nuclear magnetic resonance technique. The quadrupole coupling constants, e2qQ/h and the asymmetry parameters, η, for 7Li are 119 ± 5 kHz, 0.05 and for 23Na 2.42 ± 0.15 MHz, 0.86 respectively. In both cases, the EFG tensors show the two-fold site-symmetries at the Li- and Na-sites. For 7Li, the magnitude of the quadrupole coupling constant and the principal axis of the EFG tensor reflect the large angular distortion of the [LiO4] tetrahedron. The large quadrupole coupling constant of 23Na indicates a high degree of distortion of the Na coordination polyhedron.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223323
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetische Kernresonanz und Festkörperphysik (1970)
    Springer
    Cellular and molecular life sciences 26 (1970), S. 1-7 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Nuclear magnetic resonance (NMR) deals with isotopes possessing a nuclear magnetic dipole moment. The nuclei are used as probes to explore the internal magnetic fields in solids. Thus NMR has become a new tool in solid-state physics. Some typical examples of the application of NMR to solid-state problems are discussed. The location and orientation of water molecules in crystals are determined by NMR with relative ease. The second moment of an NMR line shape yields information on the structure as well as on the mobility of the atoms. The various types of resonance frequency shifts may be used for the understanding of the interactions and bonds in the solid and the dynamics of the crystal lattice. Very important are nuclei possessing both a magnetic dipole and an electric quadrupole moment. They serve as very sensitive detectors of the internal electric fields prevailing in solids. Apart from further structural information, NMR spectra influenced by electric quadrupole interaction may be used for studying such topics as aluminium-silicon ordering in feldspars or phase transitions in ferroelectrics. The utility of NMR in treating problems of the bonding is exemplified by showing that the covalent effects in the alkali halides are very small. Some investigations of ferromagnetism, antiferromagnetism and superconductivity are mentioned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01900352
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    Paper (German National Licenses)
    Fulltext
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