THE EFFECT OF Mn AND Ti SUBSTITUTED BARIUM FERRITE ON THE ELECTROMAGNETIC MICROWAVE ABSORBER IN THE X-BAND RANGE

Abstract

The compositional dependence of the electromagnetic wave absorption properties of barium ferrite (BaFe12 O19) in which Ti and Mn were substituted for Fe, was investigated .Single phase M-type structure was obtained for BaFe12-x(Ti0.5Mn0.5)xO19 sintered samples with composition 0&#8804;x&#8804;4.5 . The frequency dependence of reflection loss (R.L) obtained a minimum value of -21dB for the x-band frequency range (8-12GHz), and give a band width greater than 1GHz in the same frequency range . The grain size of the prepared powder were between ( 7.05-12.06 µm) .Barium ferrite-resin composites with 30,40,and 50 mass% ferrite exhipted a wide band width with R.L<-21 dB .The composite samples with composition x=3.5 and x= 4.5 had wide bandwidth of 2.5 and 1.7 GHz respectively and a R.L of-12.5 and -16 dB respectively it may be concluded that Barium M-type ferrite with substitution by Ti and Mn is a good candidate in the x-band frequency range.