Magnetic moment directions and distributions of cations in Cr (Co) substituted spinel ferrites Ni{sub 0.7}Fe{sub 2.3}O{sub 4}

Journal Article · Tue Sep 15 04:00:00 EDT 2015 · AIP Advances

DOI:https://doi.org/10.1063/1.4931919· OSTI ID:22492366

Xue, L. C.; Lang, L. L.; Li, Z. Z.; Qi, W. H.; Wu, L. Q. ^[1]; Xu, J. ^[1]

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1. Hebei Advanced Thin Film Laboratory, Department of Physics, Hebei Normal University, Shijiazhuang City, 050024 (China)

Powder samples of the spinel ferrites M{sub x}Ni{sub 0.7−x}Fe{sub 2.3}O{sub 4} (M = Cr, Co and 0.0 ≤ x ≤ 0.3) and Cr{sub x}Ni{sub 0.7}Fe{sub 2.3−x}O{sub 4} (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{sub exp}) per formula both at 10 K and 300 K increased with Co substitution, while the values of μ{sub exp} decreased with Cr substitution. Applying the assumption that the magnetic moments of Cr{sup 2+} and Cr{sup 3+} 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{sub 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.

• OSTI ID: 22492366
• Journal Information: AIP Advances, Journal Name: AIP Advances Journal Issue: 9 Vol. 5; ISSN AAIDBI; ISSN 2158-3226
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CATIONS
CHROMIUM COMPOUNDS
CHROMIUM IONS
COBALT COMPOUNDS
CONCENTRATION RATIO
COPRECIPITATION
FERRITES
MAGNETIC MOMENTS
NEUTRON DIFFRACTION
NICKEL COMPOUNDS
POTENTIALS
POWDERS
QUANTUM MECHANICS
SPINELS
X-RAY DIFFRACTION