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Magnetic moment directions and distributions of cations in Cr (Co) substituted spinel ferrites Ni0.7
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Powder samples of the spinel ferrites
Fe2.3O4 (M = Cr, Co and 0.0 ≤ x ≤ 0.3) and Cr
O4 (0.0 ≤ x ≤ 0.3) were synthesized using the chemical co-precipitation method. The XRD spectra confirmed that the samples had a single-phase cubic spinel structure. Magnetic measurements showed that the magnetic moments (μ
exp) per formula both at 10 K and 300 K increased with Co substitution, while the values of μ
exp decreased with Cr substitution. Applying the assumption that the magnetic moments of Cr2+ and Cr3+ lie antiparallel to those of the divalent and trivalent Fe, Co, and Ni cations in the same sublattice of spinel ferrites, these interesting behaviors could be easily interpreted. The cation distributions of the three series of samples were estimated successfully by fitting the dependences of μ
exp, measured at 10 K, on the doping level x, using a quantum-mechanical potential barrier model earlier proposed by our group. The results obtained for the Cr cation distributions at the (A) and [B] sites are very close to those obtained elsewhere using neutron diffraction.
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