Abstract
Orthorhombic Bi 2Fe 4 − x Cr xO 9 (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 Bi 2Fe 4 − x Cr xO 9, 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 Fe 3+ 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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