Abstract
The extreme compression (P→∞) behaviour of various equations of state with K′∞>0 yields (P/K)∞=1/K′∞, an algebraic identity found by Stacey. Here P is the pressure, K the bulk modulus, K′=dK/dP, and K′∞, the value of K′ at P→∞. We use this result to demonstrate further that there exists an algebraic identity also between the higher pressure derivatives of bulk modulus which is satisfied at extreme compression by different types of equations of state such as the Birch–Murnaghan equation, Poirier–Tarantola logarithmic equation, generalized Rydberg equation, Keane's equation and the Stacey reciprocal K-primed equation. The identity has been used to find a relationship between λ∞, the third-order Grüneisen parameter at P→∞, and pressure derivatives of bulk modulus with the help of the free-volume formulation without assuming any specific form of equation of state.
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