Authors : M. N. Giriya, D. S. Bhowmick, K. G. Rewatkar, R. P. Tandon
Page Nos : 816-825
Description :
Ca-Sr hexaferrite samples with chemical composition Ca0.5Sr0.5MexFe12-2xO19 where (x = 0, 0.5) and Me = (CoAl / CoTi) synthesized using proper stoichiometric proportions by solid state reaction at 1040oC for 105 h. The chemical phase analysis has been carried out by X-ray powder diffraction (XRD) method, which confirms the formation of the ferrite structure. It shows hexagonal magnetoplumbite (M) type structure having unit cell dimension „a‟ and „c‟ varies between 5-6 Ǻ and 21-23 Ǻ. Coercivity (Hc), saturation magnetization (Ms), Retentivity (Mr) and Bohr magnetron (ηB) measurements were carried out on a vibrating sample magnetometer (VSM) with an applied field up to 10 KOe. The results were explained in the light of Gorter‟s (1957) spin model. SEM analysis indicates that powders were platelike particles with grain size between 0.29 μm to 0.87 μm.
