Identification of force constants in β-brass

J. C. Norvell, Jens Aage Als-Nielsen

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    The phonon dispersion curves of β-brass have previously been measured by Gilat and Dolling and a fit was obtained to a Born-von Kármán model with forces extending to the fourth nearest neighbours. Although a factor of 10 was found between the second-nearest-neighbour Cu-Cu and Zn-Zn force constants, the data did not allow an identification of these constants. By comparisons of neutron group intensities from two β-brass crystals, one with normal Cu and the other isotopically enriched with 65Cu, we are able to identify conclusively these force constants: αZn-Zn2nd similar, equals 10αCu-Cu2nd.

    Original languageEnglish
    JournalJournal of Physics C: Solid State Physics
    Issue number10
    Pages (from-to)1872-1876
    Publication statusPublished - 1969

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