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  • 1990-1994  (2)
  • 1994  (2)
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  • 1990-1994  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Nanophase mixed-valence iron minerals in meteorites identified by cryogenic Mössbauer spectroscopy (1994)
    Springer
    Hyperfine interactions 91 (1994), S. 571-576 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Determination of oxidation states and the crystal chemistry of iron-bearing minerals in carbonaceous chondrites by Mössbauer spectroscopy is complicated by thermally-induced electron-hopping in cronstedtite, superparamagnetism of hydrous ferric oxides and ill-defined contributions from an incommensurate layered iron sulfide phase believed to be tochilinite. Mössbauer spectra measurements at 30 K of several terrestrial cronstedtite and tochilinite specimens have enables modal proportions of these minerals, as well as Fe3+/Fe2+ ratios, to be determined quantitatively in a suite of CM-type meteorites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02064572
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mineral Mössbauer spectroscopy: Correlations between chemical shift and quadrupole splitting parameters (1994)
    Springer
    Hyperfine interactions 91 (1994), S. 739-745 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The variety of coordination numbers, symmetries, distortions and ligand environments in thermally-stable iron-bearing minerals provide wide ranges of chemical shift (δ) and quadrupole splitting (δ) parameters, which serve to characterize the crystal chemistries and site occupancies of Fe2+ and Fe3+ ions in minerals of terrestrial and extraterrestrial origins. Correlations between ferrous and ferric chemical shifts enable thermally-induced electron delocalization behavior in mixed-valence Fe2+-Fe3+ minerals to be identified, while chemical shift versus quadrupole splitting correlations serve to identify nanophase ferric oxides and oxyhydroxides in oxidized minerals and in meteorites subjected to aqueous oxidation before and after they arrived on Earth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02064600
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    Paper (German National Licenses)
    Fulltext
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