A Test of the NaCl Equation of State by the Behavior of the Shear Velocities at High Pressure
Decker’s theoretical equation of state for NaCl  now has the enviable prestige of being used as the primary pressure standard at very high pressure. Secondary pressure standards, such as for example, the ruby fluorescent gauge , rely on the theoretical extrapolation of the P, V, T relationships calculated from the lattice potential assumed by Decker. It is somewhat remarkable that this pressure standard has had few, if any, actual tests of its validity at high pressure. There are six parameters in the potential and these are evaluated by room pressure constants, so little actual high pressure data is injected into the theory.
KeywordsElastic Constant Bulk Modulus Shear Velocity Near Neighbor Shear Constant
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