High-pressure Brillouin study of the elastic properties of rare-gas solid xenon at pressures up to 45 GPa

• Published in: Journal of Raman spectroscopy Vol. 40; no. 2; pp. 121 - 127
• Main Authors: Sasaki, Shigeo, Wada, Naoyuki, Kume, Tetsuji, Shimizu, Hiroyasu
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.02.2009
• Subjects: Adiabatic flow; Brillouin scattering; Brillouin zone; Close packed lattices; Deviation; Elastic anisotropy; Elastic constants; elastic properties; Hexagonal cells; high pressure; Phase shift; refractive index; solid xenon
• ISSN: 0377-0486; 1097-4555
• DOI: 10.1002/jrs.2087

The pressure dependences of three adiabatic elastic constants, adiabatic bulk modulus, refractive index, and elastic anisotropy, as well as Cauchy deviation of fcc solid Xe have been determined up to 10 GPa at 296 K by high‐pressure Brillouin scattering spectroscopy. The characteristics of elastic properties at high pressure of rare‐gas solid Xe are investigated by comparison with the previous studies on Ne, Ar, and Kr. Above 10 GPa, the occurrence of splitting in the Brillouin signals and the direction dependence of acoustic velocities for solid Xe clearly show partial phase transformation to the hcp structure reported by the previous X‐ray diffraction and Raman scattering studies. The shear elastic modulus in the hcp phase of solid Xe has also been estimated at pressures up to 45 GPa by using the pressure dependence of the Raman wavenumber shift for the E2g mode. Copyright © 2008 John Wiley & Sons, Ltd. Pressure dependence of the elastic constants Cij of fcc solid Xe has been determined up to 10 GPa at 296 K by Brillouin spectroscopy. The shear elastic modulus in the hcp phase of solid Xe has also been estimated up to 45 GPa from the Raman wavenumber shift for the E2g mode. The pressure dependence of the normalized elastic constants and Cauchy deviation indicate the individual elastic properties of rare‐gas solids.