Fabrication of PbFe sub(12)O sub(19) nanoparticles and study of their structural, magnetic and dielectric properties

• Published in: Journal of magnetism and magnetic materials Vol. 399; pp. 130 - 142
• Main Authors: Ghahfarokhi, SEMousavi, Rostami, Z A, Kazeminezhad, I
• Format: Journal Article
• Language: English
• Published: 01.02.2016
• Subjects: Annealing; Dielectric properties; Magnetic properties; Metal ions; Meters; Nanoparticles; Resistivity; Sol gel process
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2015.09.063

In this study, M-type Lead hexaferrite (PbFe sub(12)O sub(19)) nanoparticles were prepared by a sol-gel method and the prepared powders were annealed at 700-1000 degree 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 PbFe sub(12)O sub(19) nanoparticles at 800 degree C and 3 h are obtained. The infrared spectra measured in range of 4000-400 cm super(-1) exhibit stretching modes of metal ions in tetrahedral site at 580-550 cm super(-1) and octahedral site at 470-430 cm super(-1). The variation in ac conductivity ( sigma sub(ac)) with frequency shows that the electrical conductivity in these ferrites is mainly attributed to the electron hopping mechanism.