Electrical properties of different materials at extreme conditions

Studies of properties of various materials at extreme conditions is subject which is related to Warm Dense Plasma and High Energy Density Matter. We explored how the resistivity and temperature of wires made of tin, molybdenum, silver, and platinum evolves with time during underwater electrical explosion by ~110 kA in amplitude current pulse with rise-time of ~220 ns [1]. The discharge voltage and current were measured using a Tektronix high voltage divider and Rogowski coils, respectively. Shadow streak images of exploding wire and generated shock in water were obtained by streak camera. Time evolution of the spectrum of the light emitted by exploding wire was obtained using a spectrometer and an array of nine photomultipliers, covering a spectral range of 400 – 700 nm. The data obtained was used to determine the energy deposited at instants of solid-state - liquid - vapor phase transitions and was compared with tabulated values.