Volume Collapse Without a Structural Transition in Shock-Compressed FeO
C. Cr\'episson, T. Stevens, M. Fitzgerald, C. Camarda, P. G. Heighway, D. Peake, D. McGonegle, A. Descamps, A. Amouretti, D. A. Chin, K. K. Alaa El-Din, S. Azadi, E. Brambrink, K. Buakor, L. Pennacchioni, M. Sieber, A. Coutinho Dutra, J. Hernandez Gordillo, K. Yamamoto
TL;DR
This study investigates FeO under shock compression, revealing a volume collapse linked to a spin transition without a structural change, supported by x-ray data up to 199 GPa.
Contribution
It provides the first direct evidence of a spin transition in FeO during shock compression without a structural phase change.
Findings
FeO retains its B1 structure up to 191 GPa.
A 7-10% volume collapse occurs around 60 GPa.
The volume collapse is due to a high-spin to low-spin transition.
Abstract
We report x-ray diffraction and emission spectroscopy of FeO under laser-driven shock compression between 31-199 GPa. FeO retains the B1 (rocksalt) structure along the Hugoniot to the melt boundary at 191 GPa. While the phase and volume are broadly consistent with results from static compression, we observe an anomalous 7-10% volume collapse around 60 GPa absent in static experiments. We identify this as an isostructural high-spin to low-spin metallic transition in FeO. The low-spin state is directly evidenced by x-ray emission spectroscopy at 180 GPa.
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