Electrical resistivity and phase transformation of hematite under shock compression

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Abstract
Electrical resistivity measurements of hematite (α ‐ Fe2O3) were performed under shock compression in the range of 240–760 kbar. The specimens used were coarsely polycrystalline natural material from Brazil. The electrical resistivity decreases gradually with increasing shock pressure to 440 kbar and decreases discontinuously to less than 1 Ω cm from several tens of ohm centimeters at pressures of 440–520 kbar. The phase transformation pressure, implied in Hugoniot equation‐of‐state experiments, is made clear. The transition behavior into the low‐resistivity state depends on the crystallographic axis of shock propagation.