High temperatures and high pressures Brillouin scattering studies of liquid H(2)O+CO(2) mixtures.
The Brillouin scattering spectroscopy studies have been conducted in a diamond anvil cell for a liquid mixtures composed of 95 mol % H(2)O and 5 mol % CO(2) under high temperatures and pressures. The sound velocity, refractive index, density, and adiabatic bulk modulus of the H(2)O+CO(2) mixtures were determined under pressures up to the freezing point at 293, 453, and 575 K. It is found from the experiment that sound velocities of the liquid mixture are substantially lower than those of pure water at 575 K, but not at lower temperatures. We presented an empirical relation of the density in terms of pressure and temperature. Our results show that liquid H(2)O+CO(2) mixtures are more compressible than water obtained from an existing equation of state of at 453 and 575 K.
Key Laboratory of Earth's Deep Interior, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 10029, China.
Junfeng
J
Qin
Min
M
Li
Jun
J
Li
Rongyan
R
Chen
Zhenhao
Z
Duan
Qiang
Q
Zhou
Fangfei
F
Li
Qiliang
Q
Cui