Shock-driven amorphization and melting in Fe2⁢O3

Shock-driven amorphization and melting in Fe2⁢O3

We present measurements on Fe<sub>2</sub>O<sub>3</sub> amorphization and melt under laser-driven shock compression up to 209(10) GPa via time-resolved <em>in situ</em> x-ray diffraction. At 122(3) GPa, a diffuse signal is observed indicating the presence of a nonc...

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Bibliographic Details
Main Authors:	Crepisson, C, Amouretti, A, Harmand, M, Sanloup, C, Heighway, P, Azadi, S, McGonegle, D, Campbell, T, Pintor, J, Chin, DA, Smith, E, Hansen, L, Forte, A, Gawne, T, Lee, HJ, Nagler, B, Shi, Y, Fiquet, G, Guyot, F, Mikako, M, Bennuzi-Mounaix, A, Vinci, T, Miyanishi, K, Ozaki, N, Pikuz, T, Nakamura, H, Sueda, K, Yabuushi, T, Yabashi, M, Wark, JS, Polsin, DN, Vinko, SM
Format:	Journal article
Language:	English
Published:	American Physical Society 2025

Description
Summary:	We present measurements on Fe<sub>2</sub>O<sub>3</sub> amorphization and melt under laser-driven shock compression up to 209(10) GPa via time-resolved <em>in situ</em> x-ray diffraction. At 122(3) GPa, a diffuse signal is observed indicating the presence of a noncrystalline phase. Structure factors have been extracted up to 182(6) GPa showing the presence of two well-defined peaks. A rapid change in the intensity ratio of the two peaks is identified between 145(12) and 151(12) GPa, indicative of a phase change. The noncrystalline diffuse scattering is consistent with shock amorphization of Fe<sub>2</sub>O<sub>3</sub> between 122(3) and 145(12) GPa, followed by an amorphous-to-liquid transition above 151(12) GPa. Upon release, a noncrystalline phase is observed alongside crystalline α-Fe<sub>2</sub>O<sub>3</sub>. The extracted structure factor and pair distribution function of this release phase resemble those reported for Fe<sub>2</sub>O<sub>3</sub> melt at ambient pressure.