Optical zone-centre phonon modes and macroscopic elasticity in hcp metals

H. Olijnyk, A. P. Jephcoat

    Research output: Contribution to journalArticlepeer-review

    42 Citations (Scopus)

    Abstract

    A simple relation between zone-centre optical phonon modes and elastic constants for hcp metals derived previously from lattice dynamical force constant models using central and angular interactions is found to be reasonably valid for elemental metals with low elastic anisotropy. Application of this formalism to high-pressure phonon frequency data implies that phase transitions from hcp to Sm-type and to the ω-phase in the regular lanthanides and Zr, respectively, involve softening of the elastic constant C44, and that the rapid decrease under compression of an `unusual' high ambient-pressure TO mode Gruneisen parameter in Zn is related to the gradual transition from anisotropic→isotropic compressional behaviour with increasing pressure.

    Original languageEnglish
    Pages (from-to)335-339
    Number of pages5
    JournalSolid State Communications
    Volume115
    Issue number7
    DOIs
    Publication statusPublished - Jul 4 2000

    ASJC Scopus subject areas

    • Chemistry(all)
    • Condensed Matter Physics
    • Materials Chemistry

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