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Manganese ferrite nanoparticles were prepared by chemical co-precipitation method. Metal chlorides and sodium hydroxide were used as precursor. The spinel phase formation of the prepared samples was confirmed by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). From the XRD data, the average crystallite size and lattice constant were calculated. FTIR spectra reveal the characteristic absorption bands of spinel ferrite due to M-O stretching vibrations in tetrahedral and octahedral sites. Manganese ferrite nanoparticles were further given sintering. The effect of sintering at different temperatures on the structural properties such as XRD, FTIR and electrical properties such as dielectric constant, dielectric loss and ac-conductivity was studied. Possible mechanism of structural changes and observed electrical behavior due to sintering is being discussed. A strong correlation has also been observed in the results obtained from different characterization techniques.

This paper discusses the results of the research carried out to study the structure, optical properties and thermophysical properties of a sample (nanopowder with a true density of 4.96 g/cm³, a particle size of 60 nm and a purity of 98.5%, SkySpring Nanomaterials, USA) with high purity. Based on the results of X-ray diffraction, the crystalline phase of MnFe₂O₄ ferrite nanoparticles was completely obtained and the values of the lattice parameters were determined. The results of the MID-IR analysis showed that the absorption coefficient $(\alpha )$ reaches its maximum value at 748 cm${}^{-1}$ wave number. The optical properties of the as-prepared nanostructures were also investigated by VERTEX 70 V diffuse reflectance spectroscopy (DRS). As can be seen from the results of the DSC analysis, the effects occurring in the temperature range up to $300^{\circ }$C clearly reflect the nature of the phase transitions and the amount of energy generated in the ferrite samples.

This paper describes the structural and magnetic properties of ${\mathrm{\text{MnFe}}}_2{\mathrm{\text{O}}}_4$, which is currently widely used and is considered to be one of the promising materials. Although these features of our subject of study have been considered before us, we wanted to confirm the accuracy of these characteristics for our future purposes. In the study of the structural feature, the analysis of Raman spectroscopy was considered and the high purity of nanosized particles was revealed. The magnetic properties were analyzed by electron paramagnetic resonance (EPR) and the presence of unpaired electrons was detected, and the linewidth between the peaks ($\mathrm{\Delta }{H}_{\mathrm{\text{PP}}}=1287\mathrm{\text{G}}$) and the $g$-factor (2282) was measured.

In this paper, uniform and superparamagnetic nanoparticles have been prepared using one-step polyol synthesis method. Structural, morphological and magnetic properties of obtained MnFe₂O₄ nanoparticles have been investigated by using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM) and thermogravimetric analysis (TGA) techniques. Structural investigation showed that the average crystallite size of obtained nanoparticles was about 10nm. Magnetic study revealed that the nanoparticles were superparamagnetic at room temperature with magnetization 67emu/g at room temperature. The self-heating characteristics of synthesized MnFe₂O₄ nanoparticles were studied by applying external AC magnetic field of 167.6 to 335.2Oe at a fixed frequency of 265kHz. The SAR values of MnFe₂O₄ nanoparticles were calculated for 2, 5, 10mgmL${}^{-1}$ concentrations and it is observed that the threshold hyperthermia temperature is achieved for all concentrations.