Determination of cations distribution in Mn_(3)O_(4) by anomalous x-ray powder diffraction

摘要

The oxidation states of Mn at two different crystallographic sites in the distorted spinel structure of Mn_(3)O_(4) were determined by the approach of anomalous synchrotron x-ray powder diffraction. The real parts of anomalous scattering factors for the two Mn sites were refined from a scries of powder diffraction patterns collected at the vicinity of K absorption edge of Mn. The results of Rietveld refinements showed that the two distinct cation sites can obviously be distinguished from each other and that Mn~(2+) ions occupy the tetrahedral site and Mn~(3+) ions are located at the octahedral site.