Volume Collapse Without a Structural Transition in Shock-Compressed FeO
Materials Science
2026-04-09 v1 High Energy Physics - Experiment
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.
Cite
@article{arxiv.2604.06768,
title = {Volume Collapse Without a Structural Transition in Shock-Compressed FeO},
author = {C. Crépisson and T. Stevens and M. Fitzgerald and C. Camarda and P. G. Heighway and D. Peake and D. McGonegle and A. Descamps and A. Amouretti and D. A. Chin and K. K. Alaa El-Din and S. Azadi and E. Brambrink and K. Buakor and L. Pennacchioni and M. Sieber and A. Coutinho Dutra and J. Hernandez Gordillo and K. Yamamoto and J. -A. Hernandez and R. Torchio and T. Tschentscher and Y. Wang and H. Taylor and J. Pintor and O. S. Humphries and M. Andrzejewski and C. Baehtz and E. Barraud and A. B. Belonoshko and D. S. Bespalov and E. Boulard and R. Briggs and D. Cabaret and O. Castelnau and A. Chakraborti and J. Chantel and D. M. Cheshire and G. Collins and T. E. Cowan and Y. J. Deng and S. Di Dio Cafiso and L. Dresselhaus-Marais and X. Fang and A. Forte and S. Galitskiy and E. Galtier and T. Gawne and H. Ginestet and F. Hanby and A. Hari and N. J. Hartley and H. Höppner and N. Jaisle and J. Kim and Z. Konôpková and A. Krygier and J. Kuhlke and C. M. Lonsdale and S-N. Luo and J. Lütgert and M. Masruri and E. E. McBride and J. D. McHardy and M. I. McMahon and R. S. McWilliams and S. Merkel and T. Michelat and J-P. Naedler and B. Nagler and M. Nakatsutsumi and A-M. Norton and I. K. Ocampo and I. I. Oleynik and C. Otzen and N. Ozaki and C. A. J. Palmer and S. E. Parsons and A. Pelka and A. Phelipeau and C. Prescher and N. Pulver and C. Prestwood and C. Qu and D. Ranjan and R. Redmer and C. Sahle and A. A. Sanjuan Mora and S. Schumacher and J-P. Schwinkendorf and N. Sévelin-Radiguet and G. Shoulga and R. F. Smith and S. Singh and C. N. Somarathna and M. Stevenson and C. V. Storm and C. Strohm and T-A. Suer and M. X. Tang and A. Tipeev and M. Toncian and T. Toncian and U. Trdan and J. D. Tunacao and J. D. Umpleby-Thorp and L. Wang and M. Wilke and U. Zastrau and G. Gregori and D. Polsin and C. Sternemann and J. S. Wark and T. M. Hutchinson and C. McGuire and S. Pandolfi and A. Sollier and A. Higginbotham and T. R. Preston and D. Kraus and J. H. Eggert and K. Appel and M. Harmand and S. M. Vinko},
journal= {arXiv preprint arXiv:2604.06768},
year = {2026}
}
Comments
10 pages, 3 figures