Author(s)

M. J. S. Rocha, M. C. C. Filho, K. R. B. Theophilo, J. C. Denardin, I. F. Vasconcelos, E. B. Araújo, A. S. B. Sombra

.

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, M?ssbauer 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.

Composites; Magneto-Dielectric Materials

M. Rocha, M. Filho, K. Theophilo, J. Denardin, I. Vasconcelos, E. Araújo and A. Sombra, "Ferrimagnetism and Ferroelectricity of the Composite Matrix: SrBi₂Nb₂O₉(SBN)_X-BaFe₁₂0₁₉(BFO)_100–X," Materials Sciences and Applications, Vol. 3 No. 1, 2012, pp. 6-17. doi: 10.4236/msa.2012.31002.