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  • 1
    Electronic Resource
    Electronic Resource
    Lattice dynamics of Cr2O3 (1995)
    Springer
    The European physical journal 98 (1995), S. 197-205 
    Details
    ISSN: 1434-6036
    Keywords: 63.20.Dj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the results of inelastic neutron scattering experiments for Cr2O3 carried out using the single-crystal time-of-flight spectrometer PRISMA at ISIS (U.K.) as well as the three-axis spectrometer TAS-1 at JAERI(J). The collected data are analysed on the basis of phenomenological shell models showing convincing agreement between calculation and experiment both for the frequencies and intensities. All together the dispersion relations of 12 out of 20 phonon branches along the three-fold axis are determined. By a comparison with the Cr2O3 iso-type sapphire (Al2O3) it is found that the dynamical response of the oxygen ion is only little affected by the ionic substitution. The chromiumd electrons find their expression mainly in a strengthening of the metal-oxygen bonding. The problem of ionic polarizabilities is addressed in detail both for the oxygen and chromium ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01324525
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Lattice dynamics of sapphire (Al2O3) (1993)
    Springer
    The European physical journal 92 (1993), S. 273-283 
    Details
    ISSN: 1434-6036
    Keywords: 63.20.Dj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using inelastic neutron scattering we have determined all the dispersion branches of the Λ1, Λ2 and Λ3 representations along the three-fold axis as well as the 2 times 15 branches of Σ1 and Σ2 symmetry along the Г-A-direction plus some branches along the Г-D-direction. The experimental data are analyzed using various rigid ion, polarizable ion and shell models. The shell models give a very satisfactory account of the dispersion curves as well as the scattering intensities. Special attention is given to the investigation of dielectric constants and equilibrium conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01308745
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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