High-pressure Raman study of osmium and rhenium up to 200 GPa and pressure dependent elastic shear modulus C ₄₄

Abstract

High-pressure Raman scattering from hexagonal close-packed (HCP) metals Os and Re have been extended up to 200 GPa, and the pressure-dependent shear modulus C 44 has been deduced from the Raman-active mode E 2g , which is generated from the adjacent vibration of atoms in hexagonal planes, providing the valuable information about the elastic properties for HCP metals under high pressure. Combined with the available data of HCP metals from previous works, a further study indicates that the C 44 ′ / C 44 ratio would be close to a constant value, 0.01, with increasing atomic number of metals. The results obtained from high-pressure Raman scattering will allow us to probe the elastic anisotropy of the HCP metals at very high pressure.

In Situ Measurement Techniques Using Diamond Anvil Cell at High Pressure–Temperature Conditions: A Review

“…This phase transition is likely attributable to the coupling of the twist and orientation of the nitrogen molecule without changing the crystal symmetry. Lei et al [ 43 ] extended the Raman scattering of hexagonal close‐packed metals Os and Re to 200 GPa and derived the pressure‐dependent shear modulus C 44 from the active Raman mode E 2g arising from the vibrations of atoms on the hexagonal plane. They provided valuable information on the elastic properties of hexagonal close‐packed metals under high pressure.…”