Rietveld refinement of nanostructural LaMnO3+δ perovskite-type manganite

The nanostructural LaMnO_3+δ perovskite manganite investigated by x-ray diffraction (XRD). Our sample have been synthesized by the amorphous heteronuclear complexing method at 800°C temperature. X-ray diffraction analysis using Rietveld refinement show that our sample is single phase and crystallize in the rhombohedral distorted perovskite structure with R3̅c space group and with lattice parameters of a = b = 0.550 and c =1.334nm. It was established considerable distortion of oxygen atom in the rhombohedral structure from own initial positions 4b. Our results indicate that oxygen excess parameter for LaMnO_3+δ is 0.29. We determined the crystallite size 39 - 47 nm of LaMnO_3+δ using Scherrer equation from x-ray diffraction pattern.