HR: 17:00h
AN: V32G-05    [PDF]
TI: Elastic And Vibrational Properties Of Cobalt To 120 GPa
AU: * Goncharov, A F
EM: goncharov1@llnl.gov
AF: Lawrence Livermore National Laboratory, 7000 E Avenue, Livermore, CA 94550 United States
AU: Crowhurst, J C
EM: crowhurst1@llnl.gov
AF: Lawrence Livermore National Laboratory, 7000 E Avenue, Livermore, CA 94550 United States
AU: Zaug, J M
EM: zaug1@llnl.gov
AF: Lawrence Livermore National Laboratory, 7000 E Avenue, Livermore, CA 94550 United States
AB: The elastic and vibrational properties of hcp Co were studied by impulsive stimulated light scattering (ISLS) and by Raman spectroscopy to 120 GPa at room temperature in a diamond anvil cell. At pressures above 60 GPa the shear elastic modulus and the Raman frequency of the E2g transverse optical mode exhibit a departure from a linear dependence on density. We interpret this behavior as evidence for the high-pressure hcp-fcc transition reported previously (C. S. Yoo et al., PRL 84, 4132 2000) that is related to the collapse of the magnetic moment under pressure.
DE: 3909 Elasticity and anelasticity
DE: 3919 Equations of state
DE: 3924 High-pressure behavior
DE: 3934 Optical, infrared, and Raman spectroscopy
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2003 Fall Meeting