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Author: search.filters.author.Baitahe, RattanaiSubject: search.filters.subject.Cobalt ferrite

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    Influence of Mn doping on the magnetic properties of CoFe2O 4
    (2014-01-03)
    Roongtao, Rachanusorn
    ;
    Baitahe, Rattanai
    ;
    Vittayakorn, Naratip
    ;
    Seeharaj, Panpailin
    ;
    Vittayakorn, Wanwilai C.
    A series of CoFe<inf>2-x</inf>MnxO<inf>4</inf> ceramics were synthesized successfully by conventional solid state reaction. The X-ray diffraction analysis proved that all samples were found to have a cubic spinel structure. Diffractograms were used for Rietveld refinement to determine lattice parameters, of which lattice parameter increased with increasing Mn concentration. The microstructure of the samples was studied using scanning electron microscopy. The vibrating sample magnetometer measurements showed that the highest saturated magnetization of 118.11 emu/g and coercivity of 46.89 Oe were observed in CoFe<inf>1.85</inf>Mn<inf>0.15</inf>O<inf>4</inf> ceramic. Furthermore, X-ray absorption spectra of the samples were recorded to determine the Co, Fe and Mn valence states and their preferentially sites of the spinel structure. © 2014 Taylor and Francis Group, LLC.
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    Structural and magnetic properties of Zn doped CoFe2O 4
    (2013-12-01)
    Roongtao, Rachanusorn
    ;
    Baitahe, Rattanai
    ;
    Vittayakorn, Naratip
    ;
    Klysubun, Wantana
    ;
    Vittayakorn, Wanwilai C.
    Zinc doped cobalt ferrite powders were prepared by the solid state reaction method. The effect of zinc substitution on structure, morphology and magnetic properties was investigated. The X-ray analysis confirmed existence of the single phase cubic spinel structure, while Rietveld refinement data showed increasing of lattice parameters with zinc content. In addition, saturated magnetization increased with increasing zinc concentration and it was contained at maximum in CoFe<inf>1.9</inf>Zn0.<inf>1</inf>O<inf>4</inf> powders. However, the value of coercivity was decreased with zinc doped content. Furthermore, the oxidative states were characterized by X-ray absorption spectroscopy. The results confirm that the structure contained Co<sup>2+</sup>, Fe<sup>3+</sup> and Zn<sup>2+</sup> ions. © 2013 Copyright Taylor and Francis Group, LLC.