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Ferrimagnetism and Ferroelectricity of the Composite Matrix: SrBi<sub>2</sub>Nb<sub>2</sub>O<sub>9</sub>(SBN)<sub>X</sub>-BaFe<sub>12</sub>0<sub>19</sub>(BFO)<sub>100–X</sub>

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Author(s): I. F. Vasconcelos | E. B. Araújo | A. S. B. Sombra | J. C. Denardin | M. J. S. Rocha | M. C. C. Filho | K. R. B. Theophilo

Journal: Advances in Molecular Imaging
ISSN 2161-6728

Volume: 03;
Issue: 01;
Start page: 6;
Date: 2012;
Original page

Keywords: Composites | Magneto-Dielectric Materials

ABSTRACT
A study of the dielectric, magnetic and structural properties of composites based on M-type barium hexaferrite BFO (BaFe12O19) and SBN (SrBi2Nb2O9) is presented. The magneto-dielectric matrix composite (SrBi2Nb2O9)x(BaFe12O19)100–x, (x = 0,25,50,75 and 100 wt%) were prepared by using a new procedure based in the solid state method. X-Ray powder diffraction patterns, Raman and Infrared spectroscopy, Mössbauer spectroscopy and scanning electron microscopy (SEM) were carried out for better understanding of the microstructural, dielectric and magnetic properties. Radiofrequency (RF) dielectric permittivity, dielectric loss measurements and magnetic and electric hysteresis loops properties are also discussed throughout this paper. The hysteresis loops showed that composite samples preserve the ferrimagnetism and ferroelectricity for hexaferrite when SBN is added to the composite (BFO25P), although they become less coercive. In addition, the effects of organic binders group (TEOS, PVA and glycerin) on structural properties were also investigated.
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