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Fig. 6. XRD patterns and FE-SEM images of several α-Fe2O3 samples obtained by the same method as the α-Fe2O3-1, but either (A) PF was replaced by different Fe sources: (a1) FeCl2, (a2) K3[Fe(CN)6] or (B) PVP was replaced by different hosts: (b1) PEG-6000 and (b2) PTFE.