Synthesis and Magnetic Properties of SrFe_12-XCo_xO₁₉ (x= 0- 2) Hexaferrite Nanoparticles

Abstract:

In this paper, a batch of M- type strontium hexaferrite samples with nominal composition of SrFe_12-xCo_xO₁₉(where x= 0- 2), have been synthesized via sol- gel method. In the synthesis of samples, first a precursor gel was prepared, and then dry- gel was calcined at 1000°C for 2 hours to obtain the nano- SrFe_12-xCo_xO₁₉. The XRD results revealed that for SrFe12-xCoxO19 samples with x≤0.5, all of them have single- phase hexaferrite structure and also this data suggests that the F ³⁺ ions are substituted by Co²⁺ ions in the crystallography sites of the SrFe_12-xCo_xO₁₉, but for the samples with x>0.5, the second phase of CoFe2O4 is appeared and suggests that the Co²⁺ ions also make a distinct phase in the samples. The magnetic properties, such as saturation magnetization (Ms), magnetic remanence (Mr), magnetic coercivity (Hc), squareness ratio (Mr/Ms), crystalline anisotropy field (Ha), energy product [(BH)max] and the susceptibility χ as the derivative of M with respect to H of the upper branch of the hysteresis loop were discussed by measurements of M-H curves with vibrating sample magnetometer (VSM). The magnetic measurements revealed that the coercively (Hc) values of all the samples decrease with increasing dopant contents.

• Periodical: Advanced Materials Research (Volumes 622-623)
• Pages: 925-929
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.622-623.925
• Online since: December 2012
• Authors: M. Zargar Shoushtari, S E. Mousavi Ghahfarokhi, F. Ranjbar
• Keywords: Cobalt, Magnetic Property, Sol-Gel Method, Strontium Hexaferrite, Substitution

References

[1] S. Hussain, N. A. Shah, A. Maqsood, A. Ali, M. Naeem and W. Ahmad Adil Syed: Supercond Nov Magn Vol. 24 (2011), p.1245.

DOI: 10.1007/s10948-010-1115-z

[2] M. J. Iqbal, M. N. Ashiq and P. H. Gomez: Alloys and Compounds Vol. 478 (2009), p.736.

[3] A. Davoodi and B. Hashemi: Alloys and Compounds Vol. 509 (2011), p.5893.

[4] T. Kikuchi, T. Nakamura, T. Yamasaki, M. Nakanishi, T. Fujii, J. Takada and Y. Ikeda: Magnetism and Magnetic Materials Vol. 322 (2010), p.2381.

DOI: 10.1016/j.jmmm.2010.02.041

[5] S. E. Jacobo, C. Herme and P. G. Bercoff: Alloys and Compounds Vol. 495 (2010), p.513.

[6] P. G. Bercoff, C. Herme and S. E. Jacobo: Magnetism and Magnetic Materials Vol. 321 (2009), p.2245.

[7] M. N. Ashiq, M. J. Iqbal, M. Najam-ul-Haq, P. H. Gomez and A. M. Qureshi: Magnetism and Magnetic Materials Vol. 324 (2012), p.15.

DOI: 10.1016/j.jmmm.2011.07.016