论文信息 - Finite‐strain equation of state for high‐pressure phases

Finite‐strain equation of state for high‐pressure phases

A linear least-squares fit of a finite-strain equation of state to pressure-density measurements is possible even when the initial density is unknown. This provides an objective extrapolation of data on a high-pressure phase to zero pressure, and the zero-pressure density and elastic properties (as well as their uncertainties) can be directly estimated. For typical uncertainties in ultrahigh pressure diamond-cell experiments, compression data extending over strains of the high-pressure phase of at least 0.04 and 0.11 (i.e., compression ranges, Δρ/ρ, of at least 12% and 35%) are required in order to constrain, respectively, third- and fourth-order contributions to the equation of state.

Raymond Jeanloz | R. Jeanloz

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