Abstract
High-resolution neutron and synchrotron X-ray powder diffraction data of CaLaFeMnO 6 double perovskite have been used in a joint Rietveld refinement method to obtain accurate room temperature structure which includes a precise set of atomic positions and thermal motion parameters. The valence states of Mn and Fe in the octahedra were also determined by X-ray absorption spectroscopy by measuring Mn and Fe K edges at room temperature. The simultaneous refinement of both synchrotron X-ray and neutron diffraction data reaffirmed that the system indeed possesses orthorhombic structure with space group Pbnm. X-ray absorption spectroscopic measurements reveal that both Mn and Fe occupy the octahedral sites with valence state of +4 and +3, respectively. No cationic ordering arrangement was found and Fe/Mn was found to be randomly distributed over the octahedral sites. The results agree well with the earlier published neutron diffraction data.
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