Structure and Magnetic Properties of Co-Substituted Strontium Hexaferrite

Abstract:

The strontium hexaferrite (SrFe₁₂O₁₉) and Co-substituted strontium hexaferrite (SrCoFe₁₁O₁₉) were prepared by ceramic method. The milled mixture of Fe₂O₃, SrCO₃ and CoO powders were calcined at 1100°C and pellets sintered at 1300°C in air. The crystal structure, morphology and magnetic properties of samples have been investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and vibrating sample magnetometer (VSM), respectively. The crystal structure of SrFe₁₂O₁₉ was hexaferrite with the crystallite size and the lattice constants a and c of 59.6 nm, 5.8 Å, and 23.0 Å, respectively. Also, the crystal structure of SrCoFe₁₁O₁₉ was hexaferrite with the crystallite size and the lattice constants a and c of 63.7 nm, 5.9 Å and 23.0 Å, respectively. The morphology of obtained samples changed from hexagonal rods to discs shape and grain sizes increased with the increase of doped Co in SrFe₁₂O₁₉. SrFe₁₂O₁₉ with the coercive force (Hc) of 2,133 Oe was classified as hard ferrite magnetic. While, Co-substituted strontium hexaferrite (SrCoFe₁₁O₁₉) was soft ferrite magnetic with coercive force of 64 Oe. Results indicated that magnetic properties of samples such as hard ferrite magnetic and soft ferrite magnetic showed great dependence on the cobalt additive in strontium.

• Periodical: Advanced Materials Research (Volume 979)
• Pages: 200-203
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.979.200
• Online since: June 2014
• Authors: Pannipa Chaya*, Tula Jutarosaga, Wandee Onreabroy
• Keywords: Ceramic Method, Coercive Force, M-Type Strontium Hexaferrite

References

[1] P. Sharma, A. Verma, R.K. Sidhu, O.P. Pandey, Effect of processing parametera on the magnetic properties of strontium ferrte sintered magnets usig Taguchi orthogonal array design, J. Magn. Magn. Mater. 307 (2006) 157-164.

DOI: 10.1016/j.jmmm.2006.03.063

[2] T. Kikuchi, T. Nakamura, T. Yamasaki, M. Nakanishi, T. Fujii, Magnetic properties of La-Co substituted M- type strontium hexaferrites prepared by polmerizable complex method, J. Magn. Magn. Mater. 322 (2010) 2381-2385.

DOI: 10.1016/j.jmmm.2010.02.041

[3] T. Xie, L. Xu, Ch. Liu, Synthesis and properties of composite magnetic material SrCoxFe12-xO19 (x=0-0. 3), J. Powder. Techn. 232 (2012) 87-92.

DOI: 10.1016/j.powtec.2012.08.015

[4] CM. Feng, F. Kools, R. Metselaar, G.D. with, R.A.D. Groot, Magnetic and electronic propreties of strontium hexafrrite SrFe12O19 from first-principles calculation, J. Phys. Condens. Matter. 15 (2003) 6229-6237.

DOI: 10.1088/0953-8984/15/36/311

[5] Y. Ebrahimi, A.A.S. Alvani, A.A. Sarabi, H. Semeie, R. Salimi, A comprehensive studt on the magnetic properties of nano crystalline SrCo0. 2Fe11. 8O19 ceramic synthesized via diverse routes, J. Ceram. Inter. 38 (2012) 3885-3892.

DOI: 10.1016/j.ceramint.2012.01.040

[6] R.C. Pullar, A review of the synthersis, properties and applications of hexaferrite ceramic, Progrees in Materials Science. 57 (2012) 1191-1334.