Abstract
Cubic spinel structured Co1-xMnxFe2O4 (x = 0, 0.25, 0.5, 0.75 & 1.0) nanoparticles were successfully synthesized by the chemical precipitation method. Increase in Mn content shows a significant reduction on the crystallite size from 16.7 to 10.19 nm. FTIR vibrational bonds between 464 and 585 cm−1 confirm the interaction of metal-oxygen at tetrahedral and octahedral sites, a de-notified vibrations stretch. UV–visible diffuse reflectance spectrum indicates that Co–Mn ferrite is a direct bandgap material with bandgap ranges from 3.84 to 4.02 eV. The red-emission of the samples was confirmed form the peak at 680 nm. Formation of single domain cobalt ferrite nanoparticles of size ~38–72 nm was confirmed by TEM which exhibited morphological transition from nanobar to nanoparticles. Inductively coupled plasma emission - optical emission spectrometer result confirmed the homogeneous mixing of Co, Mn, Fe, and O atoms. The vibrating sample magnetometer study confirmed that Mn concentration favours the magnetic transition from ferromagnetism to superparamagnetism. Saturation magnetization gets reduced from 34.20 to 0.5 emu/g and the and coercivity gets reduced from 0.1112 to 0.0328 T. The X-band electron paramagnetic resonance spectrum recorded at room temperature imparts the increase of superexchange interaction with the increase in manganese concentration.
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