The frequencies of the transverse-optical Γ-point phonon were determined for the hexagonal transition metals Fe, Ru and Re by high-pressure Raman spectroscopy up to 60 GPa. Comparison is made with available theoretical frequency-data. The elastic shear constants C 44 , 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.
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Olijnyk et al. (2001) studied this question.
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