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. 2016 Sep 26;6:33295. doi: 10.1038/srep33295

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Copyright © 2016, The Author(s)

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(a,b) HRTEM, (c,d) STEM micrographs of initial core-shell nanocubes and 25 MH cycles treated nanocubes, and (e,f) amplitude maps of relative intensity of {220}_S spinel-only fringe of initial core-shell and 25 MH cycles treated nanocubes, respectively, obtained from the GPA analysis. The {220}_S corresponds to the Fe₃O₄ phase. The [001] zone-axis lies parallel to the electron beam.