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Journal of Nanomaterials
Volume 2014 (2014), Article ID 452468, 7 pages
http://dx.doi.org/10.1155/2014/452468
Research Article

Enhanced Magnetization of Sol-Gel Synthesized Pb-Doped Strontium Hexaferrites Nanocrystallites at Low Temperature

1Department of Physics and Astronomy, College of Science, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia
2Centre of Excellence in Solid State Physics, University of the Punjab, Lahore 54590, Pakistan
3Department of Physics, School of Science and Engineering (SSE), Lahore University of Management Sciences (LUMS), Lahore 54792, Pakistan
4Department of Chemical Engineering, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia
5Interdisciplinary Research Centre in Biomedical Materials (IRCBM), COMSATS Institute of Information Technology, Defence Road, Off Raiwind Road, Lahore 54600, Pakistan
6Industrial Catalysts Research Chair, King Saud University, Riyadh 11421, Saudi Arabia

Received 24 January 2014; Revised 1 May 2014; Accepted 3 May 2014; Published 27 May 2014

Academic Editor: Debasis Dhak

Copyright © 2014 Shahid M. Ramay et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Effect of Pb doping on the structural and low temperature magnetic properties of (), synthesized by sol-gel autocombustion technique, has been investigated. The powder samples were sintered at 800°C for 2 h in order to develop the stable hexagonal phase, characteristic of the SrFe12O19 structure. The consequences of Pb substitution (at iron sites) on various structural parameters like lattice constants, unit cell volume, crystallite size, and porosity have been discussed. Fourier transform infrared frequency bands were utilized to determine the formation of tetrahedral and octahedral clusters of M-type ferrites. Hexagonal texture of the grains, a characteristic of the hexagonal crystal structure of SrFe12O19, was refined by Pb substitution. The magnetic properties, determined using a vibrating sample magnetometer, revealed that saturation magnetization decreased, while coercivity was increased with the increase of Pb contents. However, the increased squareness ratio and hence the energy product motivate the utilization of these ferrite compositions where hard magnetic characteristics are required. The increased values of saturation magnetization were observed at reduced temperature of 200 K, attributable to the better spin alignments of individual magnetic moments at low temperature.