Dependance of lanthanum ions on structural, magnetic and electrical of manganese based spinel nanoferrites. Issue 5 (1st April 2020)

• Record Type: Journal Article
• Authors: Rajeshwari, A.; Kartharinal Punithavthy, I.; Johnson Jeyakumar, S.; Lenin, N.; Vigneshwaran, B.
• Is Part Of: Ceramics international. Volume 46:Issue 5(2020)
• Page Start: 6860
• Page End: 6870
• Publication Date: 2020-04-01
• Subjects: Spinel ferrites -- Dielectric properties -- Grain boundaries -- Magnetization -- Optical properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.11.180
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Lanthanum doped manganese spinel nanoferrites (MnLaX Fe2-X O4 ) 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 La 3+ doped manganese nanoferrites were elaborated with reverence to the allocation of Mn 2+ and Fe 3+ 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 La 3+ 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.