Influence of Annealing Process on the Structure and Magnetic Behavior of Ba0.5Co0.5Fe2O4 Nanoparticles | Zendy

Nadir S. E. Osman | Zendy; T. Moyo | Zendy

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Influence of Annealing Process on the Structure and Magnetic Behavior of Ba0.5Co0.5Fe2O4 Nanoparticles

Author(s) -

Nadir S. E. Osman,

T. Moyo

Publication year - 2015

Publication title -

physics procedia

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.26

H-Index - 61

ISSN - 1875-3892

DOI - 10.1016/j.phpro.2015.12.182

Subject(s) - materials science , hyperfine structure , annealing (glass) , remanence , crystallinity , analytical chemistry (journal) , atmospheric temperature range , mössbauer spectroscopy , magnetization , nanoparticle , diffraction , nuclear magnetic resonance , anisotropy , crystallography , magnetic field , nanotechnology , metallurgy , chemistry , thermodynamics , atomic physics , optics , composite material , physics , quantum mechanics , chromatography

The structure and magnetic properties of Ba0.5Co0.5Fe2O4 nanoparticles were investigated for as-synthesized and for samples annealed at temperatures of 300°C, 400°C, 500°C and 600°C. The phase structure was studied by means of X-ray powder diffraction (XRD). The XRD results reveal that the annealing effect up to 500°C decreases the sample microstrain and increases the crystallinity. Fe distribution and hyperfine parameters at tetrahedral (A) and octahedral (B) sites for the samples were studied using room temperature Mössbauer spectroscopy. The hyperfine fields increased with annealing temperature (TA). The values of the isomer shifts show only existence of Fe3+ cations on both A and B sites. We report magnetization measurements in the form of hysteresis loops in temperature range 4-300K and magnetic fields up to 5 Tesla. The results show effects of spin freezing. The values of the remanence (Mr) at 4K decreases as TA increases, whilst at 300K, Mr increases with increase in TA. The measurement of Mr at low temperature reveals evidence of cubic anisotropy

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