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Crystallite size of Fe2O3 and MgFexAl2−xO4 phases in the samples, as calculated based on XRD using the Scherrer equation. As-prepared: (□) MgFexAl2−xO4 and (Δ) Fe2O3; (■) MgFexAl2−xO4 and (▲) Fe3O4 after 5 isothermal redox cycles of H2/CO2 at 1023 K. Obtained from [81].
