Figure 4
(a) Rietveld refinement pattern of Mg–Fe–O under an assumption that the sample is a single phase of the spinel structure. An enlarged image around 13.0–14.5 degrees is also presented as an inset. (b) Rietveld refinement pattern of Mg–Fe–O under an assumption that the sample is composed from the Mg-rich spinel oxide and MgO (a rocksalt structure). The red plus marks show observed intensities, and the green solid line represents calculated intensities. The vertical bars indicate positions of allowed Bragg reflections [(a) spinel; (b) spinel (upper), rocksalt (lower)]. The blue curve at the bottom is a difference between the observed and calculated intensities at the same scale. (c) Refined crystal structure of the Mg-rich spinel oxide (Mg1.651Fe1.566O4). This figure was created using the CrystalMaker 10.7.
