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

H. Olijnyk, A. P. Jephcoat

Research output: Contribution to journalArticle

39 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
Externally publishedYes

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Elasticity
elastic properties
Metals
Elastic constants
elastic anisotropy
softening
metals
Lanthanoid Series Elements
formalism
Rare earth elements
Anisotropy
Phase transitions
interactions

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Optical zone-centre phonon modes and macroscopic elasticity in hcp metals. / Olijnyk, H.; Jephcoat, A. P.

In: Solid State Communications, Vol. 115, No. 7, 04.07.2000, p. 335-339.

Research output: Contribution to journalArticle

Olijnyk, H. ; Jephcoat, A. P. / Optical zone-centre phonon modes and macroscopic elasticity in hcp metals. In: Solid State Communications. 2000 ; Vol. 115, No. 7. pp. 335-339.
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