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Electronic Structure Studies of Nanoferrite Cu x Co1–x Fe2O4 by X-ray Absorption Spectroscopy

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Pure and mixed cobalt copper ferrites are of great interest due to their widespread application in electronics and medicine. We report on the electronic structure of a nanoferrite Cu x Co1−x Fe2O4 (0.0 ≤ x ≤ 1.0) system studied by X-ray absorption spectroscopy. These magnetic nanoferrites (average crystallite size ∼31–43 nm) were synthesized by an auto combustion method and are characterized by high resolution X-ray diffraction and near edge X-ray absorption fine structure measurements at the O K and Co, Cu, and Fe L-edges. The O K-edge spectra suggest that there is a strong hybridization between O 2p and 3d electrons of Co, Cu and Fe cations and Fe L 3, 2-edge spectra indicate that Fe ions coexist in mixed valence states (Fe3+ and Fe2+) at tetrahedral and octahedral sites of the spinel structure. Copper and cobalt ions are distributed in the divalent state in octahedral sites of the spinel structure. The origin of high saturation magnetization and coercivity in cobalt–copper ferrites are explained in light of these results.
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Keywords: COPPER-COBALT FERRITES; INVERSE SPINEL; NANOMATERIALS; X-RAY ABSORPTION SPECTROSCOPY

Document Type: Research Article

Publication date: 2011-01-01

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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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