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Article Dans Une Revue Materials Science and Engineering: B Année : 2022

Quantitative determination of surface spins contribution of magnetization, anisotropy constant, and cation distribution of manganese ferrite-silica nanocomposite

Résumé

We investigate the impact of silica concentration on the morphology, structure and and magnetic properties of xMnFe2O4-(100-x)SiO2, x=100, 15, and 10, nanocomposites synthesized by a rapid, one-step auto-combustion method. XRD patterns show formation of single-phase cubic spinel structure of MnFe2O4 in all samples without any evidence of secondary phase crystallization. According to TEM analysis, the maximum crystallite size was found for 100MnFe/Si, while 15MnFe/Si has the lowest mean size, being 7.2 nm. Cation distributions were determined using Mossbauer spectroscopy measuremnts and it was confrimed that the iron species are exclusively in Fe3+ valence state for xMnFe/Si nanocomposites. The impact of disordered surface spins on the total magnetization was systematically investigated by defining a modified Langevin function. Extensive morphological, magnetic and Mossbauer studies depicted that the MnFe2O4/Silica ratio, cations arrangement, interparticle interactions, particle volume distribution and, also, volume/surface ratio, largely impact on the magnetic characteristics of MnFe/Si nanocomposites.

Dates et versions

hal-04099010 , version 1 (16-05-2023)

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S.A. Salehizadeh, B.F.O. Costa, P. Sanguino, V.H. Rodrigues, J-M. Greneche, et al.. Quantitative determination of surface spins contribution of magnetization, anisotropy constant, and cation distribution of manganese ferrite-silica nanocomposite. Materials Science and Engineering: B, 2022, 284, pp.115902. ⟨10.1016/j.mseb.2022.115902⟩. ⟨hal-04099010⟩
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