Cation distribution correlated with magnetic properties of cobalt ferrite nanoparticles defective by vanadium doping

•Cobalt ferrite defective by vanadium doping was prepared by sol gel method.•The saturation magnetization of doped V samples is less than pure CoFe2O4.•The coercivity increases with increasing vanadium amount.•The canted angle in CoFe2-1.67xVxO4 is higher than in CoFe2-xVxO4. Nanoparticles cobalt fe...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2017-11, Vol.441, p.409-416
Main Authors: Heiba, Zein K., Mohamed, Mohamed Bakr, Ahmed, S.I.
Format: Article
Language:English
Subjects:
Cations
Cobalt
Cobalt ferrites
Coercivity
Correlation analysis
Crystal structure
Deficient
Doping
Iron
Lattice vacancies
Magnetic
Magnetic measurement
Magnetic properties
Magnetic saturation
Magnetism
Magnetization
Microstructure
Nano co-ferrite
Nanoparticles
Sol-gel processes
Structure
Studies
Tetrahedra
Vanadium
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Summary:•Cobalt ferrite defective by vanadium doping was prepared by sol gel method.•The saturation magnetization of doped V samples is less than pure CoFe2O4.•The coercivity increases with increasing vanadium amount.•The canted angle in CoFe2-1.67xVxO4 is higher than in CoFe2-xVxO4. Nanoparticles cobalt ferrite, vacancies defective through vanadium substitution for iron, were synthesized by a sol-gel method. Two systems CoFe2-xVxO4 (0.0≤x≤0.25) and CoFe2-1.67xVxO4 (x=0.1, 0.2) were prepared. The crystal structure, microstructure and magnetic properties were investigated using XRD, SEM and VSM magnetometer. The occupancy of tetrahedral and octahedral sites by different cations was determined by Rietveld analysis and correlated with magnetic measurements. Vanadium resides at octahedral sites up to x=0.10, while for higher values it resides mainly at octahedral sites with a lesser amount at the tetrahedrons. Upon increasing the vanadium content, the cell parameter decreases and the bond lengths of the tetrahedral and octahedral sites change opposite to each other. The change in the coercivity and saturation magnetization is correlated with cation distribution. For the same amount of doping x, the iron deficient samples CoFe2-1.67xVxO4 have saturation magnetization obviously reduced than the corresponding samples in CoFe2-xVxO4. The spin canting between cations in A- and B- sites was discussed in details based on Yafet–Kittel triangular arrangement model.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2017.06.021