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In this work, Mn_1-xCo_xFe₂O₄ (x=0, 0.1, 0.2, 0.3, 0.4 and 0.5) nanoparticles have been prepared by coprecipitation method. The effects of Co²⁺ substitution on the cation distribution between tetrahedral and octahedral sites in spinel structure, magnetic properties and AC magnetically induced heating characteristics were investigated. The structure and cation distribution characterized by X-ray diffraction and Raman spectroscopy showed the substituted Co²⁺ cations mainly entered to octahedral sites. The particle size of the as-coprecipitated powders observed by scanning electron microscopy decreased with cobalt additions. Magnetic properties of Mn_1-xCo_xFe₂O₄ nanoparticles studied by vibrating sample magnetometry showed the highest coercivity and saturation magnetization of 790 Oe and 32.8 emu/g for Mn_0.7Co_0.3Fe₂O₄ nanoparticles, respectively. The Mn_0.7Co_0.3Fe₂O₄ nanoparticles exhibited the AC heating temperature of 8 °C and specific loss power of 1.4 W/g in comparison with 4 °C and 0.35 W/g for the as-coprecipitated MnFe₂O₄ powders.
 

Keywords: Mn1-xCoxFe2O4, Coprecipitation, Magnetic properties, Specific loss power

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