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. 2019 May 8;9:7108. doi: 10.1038/s41598-019-43601-z

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Compositional dependence of the volume expansion of the Fe lattice per Fe atom [=V(FeH_x) − V(Fe)] due to hydrogen dissolution. The volume expansion due to dissolution of one hydrogen atom ΔV(H) {=[V(FeH_x) − V(Fe)]/x} is 2.22(±0.36) Å³ shown as a magenta dotted line. (b) Pressure dependence of the volume expansion of the fcc lattice due to dissolution of one hydrogen atom, ΔV(H). The pressure dependence calculated theoretically^4,11 is shown as a green dashed line. The abbreviations of symbols and the errors are the same as those in Fig. 4.