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. 2016 Feb 23;6:21792. doi: 10.1038/srep21792

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(A) A cm-scale photograph and (B) SEM image of the thin film of Fe₃O₄ nanostructures after transformation from Fe₂O₃ nanoparticles via combustion waves. (C) X-ray diffraction (XRD) patterns of iron oxides. (D) B-H curve of Fe₃O₄ nanoparticles after exposure to combustion wave.