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. 2019 Oct 9;8(4):21. doi: 10.1007/s40243-019-0159-7

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 2 — SEM micrographs of Si and Mg commercial powders before (a–b) and after milling for 2 h (c), 5 h (d) and 10 h (e). The average grain size is indicated together with the standard deviation. The XRD diffratograms of the starting Si and Mg powders (top) and the milled powders (bottom) are shown in (f)