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. 2018 Apr 25;4(4):eaao5864. doi: 10.1126/sciadv.aao5864

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Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 3 — From measured (A) d-spacings of ramp-loaded Fe-7Si, we determine (B) the density of the hcp structure as a function of pressure. A Vinet equation of state fit to the data along the ramp-compression path is compared to measured and extrapolated diamond anvil cell experiments: *, green dash-dotted line = Fe-6.5Si (23); +, blue dashed line = Fe-8.7Si (11). (C) d-spacing and (D) density of ramp-loaded Fe-15Si interpreted as a bcc structure. Measured/extrapolated isotherms: +, red dashed line = Fe-17.8Si (11); purple dash-dotted line = Fe-16Si (14). For comparison, the pressure-density path of ramped Fe to 300 GPa (26) and the Fe-isentrope from Sesame EOS table 2150 (27) are shown.