Fabrication of PbFe12O19 nanoparticles and study of their structural, magnetic and dielectric properties

In this study, M-type Lead hexaferrite (PbFe12O19) nanoparticles were prepared by a sol-gel method and the prepared powders were annealed at 700-1000 degrees C for 1, 1.5, 2, 2.5 and 3 h. The Lead hexaferrite powders were characterized using thermogravimetry-differential thermal analysis, X-ray diffraction, scanning electron microscopy, LCR meter, vibrating sample magnetometer, and Fourier transforms infrared spectroscopy. The size of the nanoparticles was increased with the annealing temparature. The results reveal that the best annealing temperature and annealing time for preparing PbFe12O19 nanoparticles at 800 degrees C and 3 h are obtained. The infrared spectra measured in range of 4000-400 cm(-1) exhibit stretching modes of metal ions in tetrahedral site at 580-550 cm(-1) and octahedral site at 470-430 cm(-1). The variation in ac conductivity (sigma(ac)) with frequency shows that the electrical conductivity in these ferrites is mainly attributed to the electron hopping mechanism. (C) 2015 Elsevier B.V. All rights reserved.