Reference Presenter Authors
08-136 Juscelino Chaves Sales Morais, J.E.(Universidade Federal do Ceará); Bessa, V.L.(UNIVERSIDADE FEDERAL DO CEARÁ); Sales, J.C.(Universidade Vale do Acaraú); Maia, R.G.(Universidade Federal do Ceará); Silva, M.A.(Universidade Federal do Ceará); Sombra, A.S.(Universidade Federal do Ceará); The effects of different BiFeO3 (BFO) additions (0, 20, 40, 60 and 80 wt%) on the SrFe12O19 hexaferrite ceramic matrix (SFO) have been studied by the analysis of complex impedance spectroscopy, Mössbauer spectroscopy, magnetic hysteresis and X-ray diffraction. The solid state reaction method was used for the production of the SFO and BiFeO3(BFO), the phase formation was confirmed by the X-ray diffraction and Rietveld refinement, where the values were effective for a good refinement. All peaks in the added samples are agreeing with the BFO and SFO phases. The transport properties of the materials are thermally activated and following the Arrhenius equation, where the SB60 sample presented higher values for the activation energy. The electrical behavior real and imaginary part of impedance (Z? and Z??) and imaginary part of module (M??) was analyzed through a frequency range of 1 - 107 Hz and temperature 160-300°C. The Nyquist plots showed the presence of a semicircle that was fitted by an equivalent circuit model using R - CPE association, showing the same profile in all samples. The Mossbauer spectrum was analyzed and showed that M - type hexagonal ferrites such as SrFe12O19 presents five distinct Fe3+ sites showing consistent results after the BiFeO3 presence. The addition of BFO in the formation of composites with SFO showed interesting results in the radio frequency range and presented magnetic properties that can be explored in applications in the area of telecommunications, medicine and military industry.
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