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

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.
Authors:
; ; ; ; ;  [1] ;  [1] ;  [2]
  1. Hebei Advanced Thin Film Laboratory, Department of Physics, Hebei Normal University, Shijiazhuang City, 050024 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22492366
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 9; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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