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Crystal Structure, Cation Distribution and Oxidation State of Spinel Ferrite Nanoparticles: A Synchrotron XRD and XANES Study

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The spinel ferrite nanoparticles including Ni1−x Cu x Fe2O4 (with x = 0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1), NiLa0.1Fe1.9O4 and NiY0.1Fe1.9O4 were prepared by different chemical methods with different fabrication conditions. The crystal structure, cation distribution and oxidation state of the samples were characterized by a combination of Synchrotron X-ray diffraction (SXRD) and X-ray absorption near edge spectrum (XANES). All the crystal structure information such as lattice parameters, coordinates of atoms, ion occupancy and parameters of microstructure have been determined from SXRD data on applying the full pattern fitting of Rietveld method using FullProf program. The refinement result indicates that all the samples have mixed spinel structure in which the rare earth ions locate only in the octahedral sites, while copper and nickel ions occupy both tetrahedral and octahedral sites. The oxidation state of iron and copper in the samples was identified from the XANES analysis at the Fe and Cu K-edges. The obtained results have been discussed and compared with the available data.
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Keywords: Crystal Structure; Oxidation State; Spinel Ferrite; Synchrotron Diffraction; XANES

Document Type: Research Article

Affiliations: International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology, Hanoi 100000, Vietnam

Publication date: 01 August 2016

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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