Phase evaluation of Li super(+) substituted CoFe sub(2)O sub(4) nanoparticles, their characterizations and magnetic properties

• Published in: Journal of magnetism and magnetic materials Vol. 355; pp. 70 - 75
• Main Authors: Kadam, R H, Alone, Suresh T, Mane, Maheshkumar L, Biradar, A R, Shirsath, Sagar E
• Format: Journal Article
• Language: English
• Published: 01-04-2014
• Subjects: Annealing; Automotive engineering; Coercive force; Combustion; Dielectric properties; Magnetic properties; Phase transformations; Sol gel process
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2013.11.054

Li super(+) substituted CoFe sub(2)O sub(4) with the chemical formula Lh sub(3[chi])CoFe sub(2-[chi])O sub(4) were synthesized by sol-gel auto combustion method. The synthesized samples were annealed at 600 [degrees]C for 4 h. X-ray diffraction data were used to evaluate the structure of the prepared samples. Spinel ferrite phase of CoFe sub(2)O sub(4) changes to ordered like lithium ferrite phase with increase in L super(1+) substitution. Lattice constant increases whereas particle size found to decrease with Li super(+) substitution. Infrared spectroscopy also confirmed the phase transition of CoFe sub(2)O sub(4) after the incorporation of lithium ions. Substitution of Li super(+) ions for Fe super(3+) caused a decrease in the saturation magnetization from 69.59 emu/g to 47.71 emu/g and the coercivity increased from 647 Oe to 802 Oe. Resistivity and dielectric properties shows inverse relation to each other.