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

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XRD patterns of the samples roasted with (a) different sulfur dosage at 900 °C, (b) different Fe₂O₃ dosage at 1100 °C, (c) 60% sulfur and 8% carbon, (d) 60% sulfur and 15% carbon, (e) 50% Fe₂O₃ and 8% carbon, and (f) 50% Fe₂O₃ and 15% carbon.