Abstract
Present work deals with the microwave absorption characteristics of BaFe12O19 of interest as radar absorbing material (RAM). There are very few reported works available where particle size has been critically analyzed for absorbing characteristics at microwave frequencies, therefore, in this paper microwave absorption properties of the BaFe12O19 with difierent particle sizes were investigated. The results showed that the particle size had signiflcant in∞uence on the dielectric and absorption properties of the composites in the 8.2{ 12.4GHz frequency range. BaFe12O19 powder of difierent particle sizes were synthesized by varying the annealing time and it was observed that the real part of permittivity of the composite increases from 5.18 (average value) to 7.50 (average value) and imaginary part increases from an average value of 0.20 to an average value of 2.33, whereas the real part of permeability increases from 0.95 (average value) to 1.11 (average value) and imaginary part of permeability was measured in the range of 0.02 to 0.07. These changes in permittivity and permeability afiects microwave absorption application. It is observed that the maximum bandwidth for average particle size of 240nm is 3.02GHz and with the increase in average particle size, microwave absorption properties increased.
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