Co-Ti co-substitution of M-type hexagonal barium ferrite

J. Li, H Zhang, Yinong Liu, Y. Liao, G. Ma, Hong Yang

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    Abstract

    © 2015 IOP Publishing Ltd. This paper reports a study of Co-Ti equiatomic co-substitution of M-type hexagonal barium ferrites Ba(CoTi)xFe12-2xO19, with the objective to adjust coercivity to meet different application requirements. The ferrites, with x = 0.00-1.30, all exhibited the single-phase M-type barium ferrite structure. At x = 1.30, the saturation magnetization (MS) decreased by 27.7% to 47.5 Am2 kg-1 and the coercivity (HC) decreased from 4047 to 171 Oe, providing a wide control range of coercivity. Complex magnetic permeability (μ' and μ") was measured to be μ' max = 25 and μ" max = 1.5 (at 10 MHz). The value of μ' is much higher than that of un-doped barium ferrite (x = 0.00). Co-Ti substitution reduced the coercivity whilst increased magnetic permeability. These improvements in magnetic properties are attributed to Co and Ti occupancies at different sites in the barium ferrite crystalline structure. Substitution is preferred at 4f2, 2b and 2a sites at x <0.50, but 2a and 4f1 sites at x <1.15. In addition, the bulk density (ñ) of the sintered compound was found to increase with increasing Co-Ti substitution.
    Original languageEnglish
    Pages (from-to)Article 046104
    JournalMaterials Research Express
    Volume2
    Issue number4
    DOIs
    Publication statusPublished - 2015

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    Barium
    Coercive force
    Ferrite
    Substitution reactions
    Magnetic permeability
    Ferrites
    Saturation magnetization
    Magnetic properties
    Crystalline materials
    barium ferrite

    Cite this

    Li, J. ; Zhang, H ; Liu, Yinong ; Liao, Y. ; Ma, G. ; Yang, Hong. / Co-Ti co-substitution of M-type hexagonal barium ferrite. In: Materials Research Express. 2015 ; Vol. 2, No. 4. pp. Article 046104.
    @article{5b5417d6890343988afa9af17731c196,
    title = "Co-Ti co-substitution of M-type hexagonal barium ferrite",
    abstract = "{\circledC} 2015 IOP Publishing Ltd. This paper reports a study of Co-Ti equiatomic co-substitution of M-type hexagonal barium ferrites Ba(CoTi)xFe12-2xO19, with the objective to adjust coercivity to meet different application requirements. The ferrites, with x = 0.00-1.30, all exhibited the single-phase M-type barium ferrite structure. At x = 1.30, the saturation magnetization (MS) decreased by 27.7{\%} to 47.5 Am2 kg-1 and the coercivity (HC) decreased from 4047 to 171 Oe, providing a wide control range of coercivity. Complex magnetic permeability (μ' and μ{"}) was measured to be μ' max = 25 and μ{"} max = 1.5 (at 10 MHz). The value of μ' is much higher than that of un-doped barium ferrite (x = 0.00). Co-Ti substitution reduced the coercivity whilst increased magnetic permeability. These improvements in magnetic properties are attributed to Co and Ti occupancies at different sites in the barium ferrite crystalline structure. Substitution is preferred at 4f2, 2b and 2a sites at x <0.50, but 2a and 4f1 sites at x <1.15. In addition, the bulk density ({\~n}) of the sintered compound was found to increase with increasing Co-Ti substitution.",
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    Co-Ti co-substitution of M-type hexagonal barium ferrite. / Li, J.; Zhang, H; Liu, Yinong; Liao, Y.; Ma, G.; Yang, Hong.

    In: Materials Research Express, Vol. 2, No. 4, 2015, p. Article 046104.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Co-Ti co-substitution of M-type hexagonal barium ferrite

    AU - Li, J.

    AU - Zhang, H

    AU - Liu, Yinong

    AU - Liao, Y.

    AU - Ma, G.

    AU - Yang, Hong

    PY - 2015

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    N2 - © 2015 IOP Publishing Ltd. This paper reports a study of Co-Ti equiatomic co-substitution of M-type hexagonal barium ferrites Ba(CoTi)xFe12-2xO19, with the objective to adjust coercivity to meet different application requirements. The ferrites, with x = 0.00-1.30, all exhibited the single-phase M-type barium ferrite structure. At x = 1.30, the saturation magnetization (MS) decreased by 27.7% to 47.5 Am2 kg-1 and the coercivity (HC) decreased from 4047 to 171 Oe, providing a wide control range of coercivity. Complex magnetic permeability (μ' and μ") was measured to be μ' max = 25 and μ" max = 1.5 (at 10 MHz). The value of μ' is much higher than that of un-doped barium ferrite (x = 0.00). Co-Ti substitution reduced the coercivity whilst increased magnetic permeability. These improvements in magnetic properties are attributed to Co and Ti occupancies at different sites in the barium ferrite crystalline structure. Substitution is preferred at 4f2, 2b and 2a sites at x <0.50, but 2a and 4f1 sites at x <1.15. In addition, the bulk density (ñ) of the sintered compound was found to increase with increasing Co-Ti substitution.

    AB - © 2015 IOP Publishing Ltd. This paper reports a study of Co-Ti equiatomic co-substitution of M-type hexagonal barium ferrites Ba(CoTi)xFe12-2xO19, with the objective to adjust coercivity to meet different application requirements. The ferrites, with x = 0.00-1.30, all exhibited the single-phase M-type barium ferrite structure. At x = 1.30, the saturation magnetization (MS) decreased by 27.7% to 47.5 Am2 kg-1 and the coercivity (HC) decreased from 4047 to 171 Oe, providing a wide control range of coercivity. Complex magnetic permeability (μ' and μ") was measured to be μ' max = 25 and μ" max = 1.5 (at 10 MHz). The value of μ' is much higher than that of un-doped barium ferrite (x = 0.00). Co-Ti substitution reduced the coercivity whilst increased magnetic permeability. These improvements in magnetic properties are attributed to Co and Ti occupancies at different sites in the barium ferrite crystalline structure. Substitution is preferred at 4f2, 2b and 2a sites at x <0.50, but 2a and 4f1 sites at x <1.15. In addition, the bulk density (ñ) of the sintered compound was found to increase with increasing Co-Ti substitution.

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