Magnetic and dielectric studies of barium hexaferrite (BaFe12O19) ceramic synthesized by chemical route

Barium hexaferrite BaFe12O19 (BHF) ceramic was synthesized by chemical route on sintering at 1050 degrees C for 12h. The synthesized material was characterized by XRD, SEM, AFM and TEM analysis. Metal oxide stretching frequencies corresponding to Fe-O, Ba-O, and Fe-O-Fe bands are confirmed by FTIR studies. The hexagonal nature of the BHF ceramic was confirmed by TEM analysis and Rietveld refinement with space group P6(3)/mmc. The particle size observed by TEM is 175nm. The root means square and average roughness were found to be 61.048nm and 44.025nm respectively. The M-T and M-H hysteresis loop indicates temperature dependent ferromagnetic behavior of BHF ceramic. The temperature and frequency dependent dielectric properties were explained by Maxwell-Wagner theory. The value of dielectric constant (epsilon) for BHF ceramic was found to be 22x 10(3) at 100Hz and 483K.