Sound velocity, second shock velocity and off-Hugoniot measurements of lead compressed up to 83 GPa.

Two series of shock wave experiments to investigate the sound velocity and second shock velocity of lead were carried out using a powder gun facility. An overtaking method [1] has been utilized in both types of experiments. A Photon Doppler velocimeter (PDV) was used to monitor the sample/window (either PMMA or LiF) interface velocity. The waveforms recorded in sound speed and re-shock experiments exhibit a shock wave front followed by a plateau and eventually by a release eave or a second shock wave front, respectively. Values of sound velocity obtained in present study are in good agreement with literature data for lead. Off-Hugoniot state of lead behind the release wave emanating from the sample/window interface were estimated as well. Mie-Gruneisen equation of state was calibrated to the data presented in this work.

[1] R. G. McQueen, J. W. Hopson, J. N. Fritz, Rev. Scient. Instr. 53, 245 (1982)