Shock-compressed FeO retains the B1 structure to 191 GPa but shows an isostructural 7-10% volume collapse at ~60 GPa from a high-spin to low-spin metallic transition, directly confirmed by X-ray emission spectroscopy at 180 GPa.
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Volume Collapse Without a Structural Transition in Shock-Compressed FeO
Shock-compressed FeO retains the B1 structure to 191 GPa but shows an isostructural 7-10% volume collapse at ~60 GPa from a high-spin to low-spin metallic transition, directly confirmed by X-ray emission spectroscopy at 180 GPa.