Effect of chromium substitution on structure and magnetic properties of Bi2Fe4O9 |
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Authors: | Y Du |
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Affiliation: | Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW, 2522, Australia |
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Abstract: | Orthorhombic Bi2Fe4 − xCrxO9 (x = 0.0, 0.25, and 0.75) nanoplatelets were synthesized by a simple hydrothermal method. The structure, morphology, and magnetic properties of the obtained powders have been characterized. Calculation of the lattice parameters of Bi2Fe4 − xCrxO9, as well as bond lengths and angles, was carried out by X-ray diffraction Rietveld refinement. The volumes of the metal-oxygen tetrahedra and octahedra were calculated to be sequentially increasing as the Cr doping level increases. The samples undergo an antiferromagnetic transition at 250 ± 5 K. The magnetic moments of the samples increase with higher Cr doping level. The 3d electron spin state for Fe3+ in the as-prepared samples is different, which is possibly due to the distortion of Fe-O tetrahedra and octahedra in the crystal structure after chromium substitution. |
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Keywords: | Bi2Fe4O9 Doping Structure Magnetic Spin state |
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