On optical phonons and elasticity in the hcp transition metals , and at high pressure
Department of Earth Sciences, University of Oxford -
Oxford OX1 3PR, UK
Accepted: 6 December 2000
The frequencies of the transverse-optical Γ-point phonon were determined for the hexagonal transition metals , and by high-pressure Raman spectroscopy up to . Comparison is made with available theoretical frequency-data. The elastic shear constants C44, determined from the Raman frequencies, are consistent with ultrasonic low-pressure data and theoretical high-pressure data and do not support the high-pressure data obtained from lattice-strain experiments.
PACS: 62.20.Dc – Elasticity, elastic constants / 62.50.+p – High-pressure and shock-wave effects in solids and liquids / 78.30.Er – Solid metals and alloys
© EDP Sciences, 2001