Dependance of lanthanum ions on structural, magnetic and electrical of manganese based spinel nanoferrites

Abstract Lanthanum doped manganese spinel nanoferrites (MnLaXFe2-XO4) with X = 0.00, 0.02, 0.04, 0.06 and 0.08 were fabricated by sol-gel method. The cubic phase was confirmed by using X-ray diffraction technique. FESEM revealed that the prepared samples attain highly stable spherical morphology. Energy dispersive X-ray spectra confirm the presence of Manganese (Mn), Lanthanum (La), Iron oxide (Fe) and oxygen (O) element in desired proportion. Ultra-violent diffuse reflectance spectroscopy shows that absorbance spectra were inversely proportional to band gap energy. Room temperature magnetic hysteresis curves expose the ferromagnetic behavior with decreases of saturation (Ms) and increases of coercivity (Oe). The origin of ferromagnetism in La3+ doped manganese nanoferrites were elaborated with reverence to the allocation of Mn2+ and Fe3+ ion within the spinel lattice. An impedance spectroscopy of the samples were analyzed in the frequency ranges from 0 to 7 MHz at room temperature reveals the resistance of the grains and grain boundary were found to increase with La3+ ion. The dielectric constant and loss tangent decreases with increases of frequency. The obtained results confirm that the prepared samples were useful for better radiation-absorption properties.