Shock-induced conductivity waves at metal-metal, metal-semiconductor transitions and in high porous nickel foam

The electrical properties of metals show strong variations under shock wave action (metal-semiconductor, metal-metal and metal-vapor transitions). The thin foil method of conductivity measurement (Keeler 1974) is unavailable for materials with an internal structure (metallic foams, powders, conductive compacts etc.), because of the large time of the current relaxation in thick samples made of such materials. The essential point of measurements is the consideration of the transient electrodynamic processes in a sample. Conceptually this problem is very close to the analysis of the non-stationary electrodynamics of the shock-induced waves of the conductivity in initially unconducting materials (Bichenkov et al. 1989).