Specific Absorption Rate Dependency on the Co2+ Distribution and Magnetic Properties in CoxMn1-xFe2O4 Nanoparticles

Mixed ferrite nanoparticles with compositions CoxMn1-xFe2O4 (x = 0, 0.2, 0.4, 0.6, 0.8, and 1.0) were synthesized by a simple chemical co-precipitation method. The structure morphology of the obtained X-ray diffraction (XRD), transmission electron microscope (TEM), Raman spectroscopy, Mössbauer spectroscopy. average crystallite sizes decreased increasing x, starting 34.9 ± 0.6 nm for MnFe2O4 0) ending 15.0 0.3 CoFe2O4 1.0). TEM images show an edge majority particles having cubic geometry wide size distributions. mixed have inverse spinel indicated splitting A1g peak at around 620 cm?1 in spectra. intensity ratios A1g(1) A1g(2) peaks indicate significant redistribution Co2+ Fe3+ cations among tetrahedral octahedral sites nanoparticles. Magnetic hysterics loops that all possess remnant magnetization coercivity room temperature. mass-normalized saturation is highest composition x 0.8 (67.63 emu/g), while has value 65.19 emu/g. PEG (poly ethylene glycol) coated examined magneto thermic heating ability using alternating magnetic field. Heating profiles frequencies 333.45, 349.20, 390.15, 491.10, 634.45, 765.95 kHz 200, 250, 300, 350 G field amplitudes obtained. 0.2 (Co0.2Mn0.8Fe2O4) 57.41 emu/g shows specific absorption rate (SAR) 190.61 W/g 10 mg/mL water dispersions frequency strength. SAR values increase concentration particle dispersions, whereas MnFe2O4, decrease dispersions. SARs Co0.2Mn0.8Fe2O4 fixed agar ferrogel strength are 140.35 67.60 W/g, respectively. This study importance optimizing occupancy system, nanoparticle viscosity surrounding medium on properties efficiencies.