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. 2016 Sep 21;6:33375. doi: 10.1038/srep33375

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Copyright © 2016, The Author(s)

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²⁷Al NMR spectra of the samples after various milling times: (a) 4 h, (b) 5 h and (c) 6 h. Minor peaks equally distant from the central lines are from spinning side bands. The spectra are normalized to maximal intensity. (d) Schematic structural evolution of Al during milling.