SYNTHESIS AND CHARACTERIZATION OF RARE EARTH SUBSTITUTED M -TYPE (Sr-Ba) HEXAFERRITES

Abstract

Effect of Rare earth elements (PrMn) substitution on the structural of Electrical and Dielectric properties Sr0.5-x Ba0.5PrxMnyFe12-yO19 (x =0.00–0.10; y =0.00–1.00) Hexaferrites prepared by sol–gel auto combustion is reported. The synthesized samples were characterized by Fourier Transform Infrared (FTIR) Spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), AC and DC analysis. The XRD analysis confirmed the formation of single and double phase M-type Hexa-ferrite structures. The lattice parameters were found to be increasing as Rare earth (PrMn) contents were increasing, which is attributed to the ionic sizes of the implicated cations. The rare earth (PrMn) seems to be entirely soluble in the lattice. SEM revealed that the grain size decreased with increasing rare earth (PrMn) substitution. The coercivity values (780– 1077cm-1 ) of all sample lies in the range of M-type hexa-ferrite’s, which indicated that an increase of anisotropy was achieved by substitution of rare earth doping, while the size of particles drastically reduced from 10 to 1 µm. The increased anisotropy and fine particle size is useful for many applications such as improving signal noise ratio of recording devices.