R.F. Truninb aAll-Russian Scientific Research Institute of Experimental Physics — Federal Nuclear Centre, prosp. Mira 37, Sarov, Nizhny Novgorod region, 607190, Russian Federation bSarov State Institute of Physics and Technology, ul. Dukhova 6, Sarov, Nizhny Novgorod region, 607186, Russian Federation
This paper reviews the results of experimental research on shock-compressed porous metals conducted in laboratory conditions and underground nuclear explosion environments. The general properties of shock adiabats are discussed. A rather simple wide-range equation of state is applied to describe the totality of test data. Porous metals and silicates are comparatively studied for, and found to qualitatively differ in, their behavior over a wide pressure range (tens of GPa). A possible explanation for the nonstandard behavior of silicates is that the Grüneisen coefficient in these states of matter can assume negative values at elevated pressures and temperatures. A similar anomaly is hypothesized to account for the superadiabatic density growth in the upper mantle of Earth.