Effect of Heat Treatment on the Structural and Magnetic properties of Sr1-x Fe12-y Cox Aly O19

Abstract

Abstract Hexaferrites have recently fascinated researcher’s interest due to their broad range of uses, including permanent magnets, magnetic storage media, wireless telecommunication and microwave application. In this work Sr1-x Fe12-y Cox Aly O19(x=0.2, y=0.2) was synthesized by using the sol gel auto combustion method and sintered for 5 hours at different temperatures ranging from 800°C to 1100°C. The formation of M-type hexaferrites has been confirmed by XRD analysis. The appearance of three major peaks i.e., 432cm-1,547cm-1,594-1 in the FTIR spectra between 400 cm-1 and 600 cm-1 indicates the existence of M-type hexagonal ferrites. FESEM shows plate like hexagonal shaped grains. The temperature at which hexaferrite was obtained determined by TGA analysis. The M-H loop derived from the vibrating sample magnetometer was used to compute magnetic parameter.