The Structural Phase Transition in Octaflournaphtalene

Gordon A. Mackenzie, J. W. Arthur, G. S. Pawley

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    Abstract

    The phase transition in octafluoronaphthalene has been investigated by Raman scattering and neutron powder diffraction. The weight of the experimental evidence points to a unit cell doubling in the a direction, but with no change in space group symmetry. Lattice dynamics calculations support this evidence and indicate that the mechanism of the phase transition may well be the instability of a zone boundary acoustic mode of librational character. The structure of the low-temperature phase has been refined and the Raman spectra of the upper and lower phases are reported.
    Original languageEnglish
    JournalJournal of Physics C: Solid State Physics
    Volume10
    Issue number8
    Pages (from-to)1133-1149
    ISSN0022-3719
    DOIs
    Publication statusPublished - 1977

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