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. 2016 Feb 24;6:21832. doi: 10.1038/srep21832

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(a) Measured between 10 K and 400 K, H = 3000 Oe. (b) Measured between 300 K and 700 K, H = 1000 Oe. (c,d) Measured between 300 K and 800 K, H = 500 Oe. The insets are the derivatives of M_s with respect to temperature. (e) The contents of C, O and N for Sample 2 heat-treated at different temperatures. (f) Thermogravimetric curves of Sample 0 and Sample 2.