Aj. Campbell et Dl. Heinz, HIGH-PRESSURE ACOUSTIC-WAVE VELOCITIES AND EQUATIONS OF STATE OF THE ALKALI CHLORIDES, J GEO R-SOL, 99(B6), 1994, pp. 11765-11774
Acoustic wave velocities have been measured in RbCl and CsCl to 17 GPa
. The compressional wave velocities vary with density as V(P) (km/s) =
3.4143(84) + 1.368 (11) DELTArho for the high-pressure phase of RbCl
and V(P) (km/s) = 2.8247 (57) + 1.1469 (77) DELTArho for CsCl (numbers
in parentheses indicate uncertainties on the last digit). The equatio
ns of state of RbCl and CsCl have also been determined at room tempera
ture to approximately 30 GPa. Eulerian finite strain equation of state
parameters are rho02 = 3.3068 (10) Mg m-3, K(0T) = 17.9 (10) GPa and
K(0T)' = 5.23 (29) for RbCl in the B2 structure, and K(0T) = 17.01 (29
) GPa and K(0T') = 5.49 (15) for CsCl. The accumulated set of data for
the alkali chlorides under high pressure is used to test several empi
rical relations between velocity and density. A simple logarithmic rel
ation is shown to allow the most accurate extrapolation from low-press
ure velocity data. Gruneisen's parameters are also calculated from the
velocity and density data, allowing a complete thermal equation of st
ate tp be developed for the alkali chlorides.