Laser-driven shock compression and equation of state of Fe${}_2$O${}_3$ up to 700 GPa

Abstract

We report here the first equation of state measurements of Fe${}_2$O${}_3$ obtained with laser-driven shock compression. The data are in excellent agreement with previous dynamic and static compression measurements at low pressure, and extend the known Hugoniot up to 700 GPa. We observe a large volume drop of $\sim$10% at 86 GPa, which could be associated, according to static compression observations, with the iron spin transition. Our measurements also suggest a change of the Hugoniot curve between 150 and 250 GPa. Above 250 GPa and within our error bars, we do not observe significant modifications up to the maximum pressure of 700 GPa reached in our experiment.

8 pages, 3 figures, 2 tables