Measurement on Effective Shear Viscosity Coefficient of Iron under Shock Compression at 100GPa

The oscillatory damping curve of a shock front propagating in iron shocked to 103GPa is measured by use of two-stage light-gas gun and electric pin techniques. The corresponding effective shear viscosity coefficient is deduced to be about 2000 Pa・s from Miller and Ahrens' formula. The result is consistent with that of Mineev's data at 31GPa, while it is higher by five orders than the predictions based on the static measurements at about 5GPa and 2000K and molecular dynamic simulation up to 135-375GPa and 4300-6000K, and the discussions are presented.