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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. 4 — The unit cell ratios of hcp-structured Fe-7Si alloy were calculated from the x-ray diffraction patterns using all three observed hcp reflections (red squares) or only the two stronger reflections (blue circles). Low-pressure DAC data (gray symbols) predict a relatively modest increase in c/a ratio with increasing temperature (15, 23), approaching closer to the ideal hcp ratio of 1.633.