Abstract
Equation of state data on calcite obtained from shock compression and release wave experiments are reported. Powder gun and two-stage gun impact technology along with time-resolved velocity interferometry, are used to produce and measure planar shock and release wave states. Experiments are performed on crystalline calcite and on dry- and water-saturated porous calcite at shock pressures ranging from 10 to 66 GPa. Developmental work required to perform high-pressure shock -wave experiments on porous samples with the two-stage gas gun is described. Lagrangian analysis methods are used to determine pressure-density release paths from measured wave profiles. A high-pressure phase change in calcite has been identified from the release-wave data. Calculational results obtained using a model based on a theory of immiscible mixture are compared with the experimental data.
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