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. 2015 Mar 17;5:9164. doi: 10.1038/srep09164

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The XRD peaks of SnO₂ (indicated by triangles) in all samples are indexed to the tetragonal crystal structure of SnO₂ (JCPDS No. 41-1445, black line in (a)) and the Co₃O₄ peaks (indicated by stars) in the samples are indexed to pure face centered cubic (fcc) crystal structure of Co₃O₄ (JCPDS No. 42-1467, red line in (a)).