Synthesis of Coersivity and Magnetic Moment of Nanoparticle Sized Aluminium Substituted Copper Cobalt Ferrites

The polycrystalline aluminium substituted nano-particle sized copper cobalt ferrite samples CuxCo1-xFe2-2yAl2yO4 (where x= 0.0, 0.2, 0.4, 0.6, 0.8, 1.0; y = 0.05, 0.15 and 0.25) have been prepared by standard ceramic technique. Phase formation is investigated using X-ray diffraction, Infrared absorption technique and Scanning electron microscope technique. Magnetic properties of the samples are investigated by using Vibrating Sample Magnetometer (VSM) and Helmholtz's double coil apparatus. The lattice constants of the all samples are evaluated from x-ray diffraction data. A universal testing machine as well as Archimedes's method was applied for determining the physical properties of the samples. Ionic radii RA and bond lengths (A-O) on both sites are found decreases with Al3+ and copper content. The Lattice constant ‘a’, physical density as well as X-ray density of samples goes on increasing with Al3+ and copper content. The ratio c/a is found increasing when addition of copper content and decreases with aluminum content. It means that Al3+ and copper acquire the tetragonal prolate type distortions on B site and hence (c/a) ratio increases and automatically crystal lattice turned from tetragonal spinel to cubic spinel. Addition of Al3+replaces Fe3+on A-site and hence magnetic moment per unit values decreases. Copper cobalt ferrite exhibits canting of spins of magnetic moments on B-site. The canting angle αyk is found decreasing with Al3+content in the host lattice.