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- W2804985909 abstract "Abstract NiFe2O4 and CoFe2O4 nanoparticles present different efficiencies as magnetic heating agents due to their respectively soft and hard magnetic properties. The substitution of Ni by Co to form mixed NixCo(1-x)Fe2O4 nanoparticles is employed, along with thermal treatment, to tailor their heating efficiency by modification of their structural and magnetic properties. For that purpose, nanostructured NixCo(1-x)Fe2O4 (with x = 0.00, 0.25, 0.50, 0.75 and 1.00) were synthesized by coprecipitation and annealed at 400, 700 and 1000 °C. The substitution of Ni by Co allows obtaining particles with progressively lower saturation magnetization and magnetic anisotropy. Heat treatment allows modifying the saturation magnetization and coercivity differently, by enhancing hyperfine magnetic fields and increasing the particle size beyond the transition from monodomain to multidomain behaviour, respectively. Samples annealed at 700 °C exhibit the largest coercivity and anisotropy values, whilst magnetization values increase progressively with the annealing temperature. The AC induced heating efficiency of NixCo(1-x)Fe2O4 increases with Ni content due to increased minor hysteresis losses. For a given time of exposure and concentration, selection of the nanoparticle size and Ni content allows to obtain different efficiencies, which can be selected according to the heating applications involved." @default.
- W2804985909 created "2018-06-01" @default.
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- W2804985909 date "2018-08-01" @default.
- W2804985909 modified "2023-09-26" @default.
- W2804985909 title "Structure, magnetism and magnetic induction heating of Ni x Co (1-x) Fe 2 O 4 nanoparticles" @default.
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- W2804985909 doi "https://doi.org/10.1016/j.jallcom.2018.05.124" @default.
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