Authors : B. S. Satone, K. G. Rewatkar, A.S.Kakde, P. S. Sawadh, M.S. Choukuse.
Page Nos : 155-161
Description :
Abstract:
In the present research module the samples with chemical composition CaMeFe11O19 (where Me = Al and Cr) were successfully synthesized using perfect stoichiometeric proportions of reacting oxides by sol gel auto-combustion method. X - ray diffraction analysis of sample showed that both the compounds are in single, hexagonal M - type phase with unit cell dimensions ‘a’ and ‘c’ varies between 5 to 6 Ǻ and 21 to 23 Å respectively with space group SG:P63/mmc (No. 194). Scanning Electron Microscopy (SEM) analysis showed a good crystallization, smooth surface without any cracks. The Transmission Electron Microscopy (TEM) analysis proved that the compounds belong to nanoparticle range. The magnetic properties measured using vibrating sample magnetometer (VSM), optimized saturation magnetization (Ms) of the compound reached 67.9emu/g and 14.8emu/g for Al and Cr substituted compound respectively, while coercive force (Mr) ranges between 3386.1 Oe for Al and 1046.0 Oe for Cr. These values are close to that of its counterpart CaM.
Keywords: Nanoferrite, Saturation magnetization, Coercivity, Sol gel auto combustion, X – ray diffraction, etc.
