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Hexagonal ferrites are incorporated in microwave communication technology, recording, antielectromagnetic interference coatings, radar absorbing materials (RAM), transformers and other technological applications. In this work we have synthesized Mtype Ba0.5Sr0.5MxFe(122x)O19 (M = CoRu, CoZr and CoTi) and Ba(1x)SrxFe12O19 hexagonal ferrite and characterized ferrite using XRD and SEM. Hysteresis parameters have been investigated as a function of substitution. Complex permittivity, Complex permeability and Reflection loss have been studied as a function of frequency (Xband), substitution and thickness. Sample 1.0 of CoZr ferrite shows maximum absorption with reflection loss of 37 dB at 12.08 GHz, rendering its use for microwave absorber application. High temperature enhances dielectric properties in comparison to the magnetic properties in Ba0.5Sr0.5MxFe(122x)O19 and Ba(1x)SrxFe12O19 ferrite. Saturation magnetization increases in Ba0.5Sr0.5MxFe(122x)O19 ferrite at lower substitution whereas it decreases at higher substitution. Remanence magnetization is increases: with Sr ions substitution in Ba(1x)SrxFe12O19 ferrite and in the undoped sample 0.0 of Ba0.5Sr0.5MxFe(122x)
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