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  • 1970-1974  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Determination of the normal vibrational displacements in several perovskites by inelastic neutron scattering (1970)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 26 (1970), S. 608-612 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Relative displacements of the atoms corresponding to the lowest frequency long wavelength transverse optic phonon of several materials with the perovskite structure were determined directly by a least-squares refinement of the integrated intensity of inelastic neutron scattering. The modes of KTaO3 and SrTiO3 were identified as being of the Slater type, in which oxygen atoms vibrate against Ta and Ti atoms. In the case of RbMnF3, however, an entirely different vibrational motion was obtained, in which Rb ions vibrate out of phase with the rigid MnF3 group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739470001547
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Derivation and experimental verification of the normalized resolution function for inelastic neutron scattering (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 160-169 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Based upon the work of Cooper & Nathans, an expression for the normalized resolution function of a triple-axis neutron spectrometer is derived and tested experimentally. The formalism is extended to show the explicit dependence of the integrated intensity of a sharp excitation spectrum on all of the relevant instrumental parameters. Extensive measurements of the integrated intensities of phonons in copper have been carried out for a wide range of all adjustable parameters. The experimentally determined intensities are found to be in good agreement with the calculated values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739473000422
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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