Fig. 1

X-ray powder diffraction pattern of the iron oxide powder (left), prepared by modified sol–gel method and annealed at 300 °C, in relation to the position of reference peaks originated from alpha and gamma phases. Result of the Rietveld analysis (right) of the nanocomposite α-Fe₂O₃/γ-Fe₂O₃ heated at 300 °C (black line– XRD pattern; red—fitted diffraction; black—differential pattern; blue and black—positions of reference phase peaks)