High-pressure Brillouin scattering of amorphous BeH2.
High-pressure micro-Brillouin scattering is employed to investigate the pressure dependence of the sound velocity, refractive index, equation of state, and mechanical properties of amorphous BeH2. The refractive index n has been determined by using two scattering geometries (70 degrees and 180 degrees). The equation of state is deduced from the pressure dependences of the sound velocity. The bulk modulus is 14.2 (+/-3.0) GPa and its pressure derivative is 5.3 (+/-0.5). The polarizability is calculated from the refractive index and the density of the material. It increases with pressure while Poisson's ratio decreases with pressure.
Ahart
Muhtar
M
Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Rd., N.W., Washington, DC 20015, USA. m.aihaiti@gl.ciw.edu
Yarger
Jeffery L
JL
Lantzky
Kristina M
KM
Nakano
Satoshi
S
Mao
Ho-Kwang
HK
Hemley
Russell J
RJ