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. 2017 Feb 10;7:42536. doi: 10.1038/srep42536

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Surface properties of natural marmatite (1), the ZnO roasted with 70% sulfur (2), and the ZnO roasted with 60% sulfur and 50% Fe₂O₃ (3): (a) XPS survey spectra, (b) chemical compositions on the surface of these samples, and high-resolution scans for (c) O 1 s, (d) Fe 2p, and (e) Zn 2p electrons.