Electrical Conductivity of ε-Iron under Shock Compression up to 208GPa

The electrical conductivity of shock-compressed iron was measured up to 208GPa by using an improved design in experiment assembly in which the iron sample was encapsulated in a single-crystal sapphire cell. High-pressure shock compressions were generated by the plate impact technique with the two-stage light-gas gun. The measured conductivity of iron varies from 1.45 x 10⁴Ω^-1cm^-1 at 101GPa and 2010K to 7.65 x 10³Ω^-1cm^-1 at 208GPa and 5220K. After examining these data together with those reported, we found that the Bloch-Grüneisen expression is still valid at high pressures and temperatures, even up to 208GPa and 5220K, at least for ε-iron, which is significant in the filed of condensed matter physics and deep interior earth science.