Fig. 2
From: Progress in Iron Oxides Based Nanostructures for Applications in Energy Storage
a Schematic diagram of in-situ XRD. b Equilibrium between Fe, Fe1−yO, Fe3O4, CO, CO2, and carbon. c XRD pattern of initial reactants. d XRD pattern of the sample synthesized at Pco/Pco2 = 1:1. e XRD pattern of the sample synthesized at Pco/Pco2 = 1:2. f The different NR function-apparent lattice constants of wustite synthesized at different temperatures and Pco/Pco2. g The results of lattice constant of wustite