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X-ray diffraction patterns of nanoparticles before and after temperature treatment (at 500 °C): (A) Co0.05, Co0.10, Co0.15; (B) Mn0.05, Mn0.10, Mn0.15; (C) Ni0.05, Ni0.10, Ni0.15. Note: ● Fe3O4 signals, □ α-Fe2O3 signals. (D–F) Respective series zoom on peak (311) of magnetite structure.
