Fabrication of SrFe_12−xNi _xO₁₉ nanoparticles and investigation on their structural, magnetic and dielectric properties

Abstract

SrFe_12−xNi _xO₁₉ nanoparticles (x = 0–1) were synthesized by a combustion sol–gel method. Their structure, dielectric and magnetic properties were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), an LCR metry, and vibrating sample magnetometry (VSM).The results reveal that all samples of Ni doped compounds (SrFe_12−xNi _xO₁₉) with x < 0.2 are single phase. It appears that the Fe³⁺ ions are substituted by Ni²⁺ ions on the crystallographic sites of the SrFe₁₂O₁₉ structure; however, for x ≥ 0.2, the secondary Ni phase ferrite (NiFe₂O₃) appears, which reduces the saturation magnetization and coercivity. In addition, Ni doping reduces the dielectric constant, dielectric loss, and alternating current (ac) electrical conductivity of the samples. The variation in ac conductivity (σ _ac) with frequency shows that the electrical conductivity in these ferrites is mainly attributed to the electron hopping mechanism.Therefore; all the single-phase Ni doped samples are suitable for use in magnetic recording media and microwave devices.

Keywords

magnetic particles / nanoparticles / structure / dielectric properties / magnetic properties

References

[1] Hochepied J.F., Pileni M.P. Magnetic properties of mixed cobalt–zinc ferrite nanoparticles. J. Appl. Phys., 2000, 87(5): 2472.

[2] Anis-ur-Rehman M., Asghar G. Variation in structural and dielectric properties of co-precipitated nanoparticles strontium ferrites due to value of pH. J. Alloys Compd., 2011, 509(2): 435.

[3] Hussain S., Shah N.A., Maqsood A., Ali A., Naeem M., Ahmad Adil Syed W. Characterization of Pb-doped Sr-ferrites at room temperature. J. Supercond. Novel Magn., 2011, 24(4): 1245.

[4] Davoodi A., Hashemi B. Magnetic properties of Sn–Mg substituted strontium hexaferrite nanoparticles synthesized via coprecipitation method. J. Alloys Compd., 2011, 509(19): 5893.

[5] Iqbal M.J., Ashiq M.N., Gomez P.H. Effect of doping of Zr–Zn binary mixtures on structural, electrical and magnetic properties of Sr-hexaferrite nanoparticles. J. Alloys Compd., 2009, 478(1-2): 736.

[6] Iqbal M.J., Ashiq M.N. Physical and electrical properties of Zr–Cu substituted strontium hexaferrite nanoparticles synthesized by co-precipitation method. Chem. Eng. J., 2008, 136(2-3): 383.

[7] Mousavi Ghahfarokhi S.E., Ranjbar F., Zargar Shoushtari M. A study of the properties of SrFe_12-xCo_xO₁₉ nanoparticles. J. Magn. Magn. Mater., 2014, 349, 80.

[8] Iqbal M.J., Ashiq M.N., Gomez P.H., Munoz J. M. Synthesis, physical, magnetic and electrical properties of Al–Ga substituted co-precipitated nanocrystalline strontium hexaferrite. J. Magn. Magn. Mater., 2008, 320(6): 881.

[9] Ashiq M.N., Iqbal M.J., Gul I.H. Structural, magnetic and dielectric properties of Zr–Cd substituted strontium hexaferrite (SrFe₁₂O₁₉) nanoparticles. J. Alloys Compd., 2009, 487(1-2): 341.

[10] Hessien M.M., Rashad M.M., El-Barawy K. Controlling the composition and magnetic properties of strontium hexaferrite synthesized by co-precipitation method. J. Magn. Magn. Mater., 2008, 320(3-4): 336.

[11] Kikuchi T., Nakamura T., Yamasaki T., Nakanishi M., Fujii T., Takada J., Ikeda Y. Magnetic properties of La–Co substituted M-type strontium hexaferrites prepared by polymerizable complex method. J. Magn. Magn. Mater., 2010, 322(16): 2381.

[12] Jacobo S.E., Herme C., Bercoff P.G. Influence of the iron content on the formation process of substituted Co–Nd strontium hexaferrite prepared by the citrate precursor method. J. Alloys Compd., 2010, 495(2): 513.

[13] Iqbal M.J., Ashiq M.N., Gul I.H. Physical, electrical and dielectric properties of Ca-substituted strontium hexaferrite (SrFe₁₂O₁₉) nanoparticles synthesized by co-precipitation method. J. Magn. Magn. Mater., 2010, 322(13): 1720.

[14] Ahmad M., Aen F., Islam M.U., Niazi S.B., Rana M.U. Structural, physical, magnetic and electrical properties of La-substituted W-type hexagonal ferrites. Ceram. Int., 2011, 37(8): 3691.

[15] Liu M.Q., Shen X.Q., Song F.Z., Xiang J., Meng X.F. Microstructure and magnetic properties of electrospun one-dimensional Al³⁺-substituted SrFe₁₂O₁₉ nanofibers. J. Solid State Chem., 2011, 184(4): 871.

[16] Iqbal M.N., Ashiq M.J., Hernandez-Gomez P., Maria Munoz J. Magnetic, physical and electrical properties of Zr–Ni-substituted co-precipitated strontium hexaferrite nanoparticles. Scripta Mater., 2007, 57(12): 1093.

[17] Bercoff P.G., Herme C., Jacobo S.E. The influence of Nd–Co substitution on the magnetic properties of non-stoichiometric strontium hexaferrite nanoparticles. J. Magn. Magn. Mater., 2009, 321(14): 2245.

[18] Ashiq M.N., Iqbal M.J., Gul I.H. Effect of Al–Cr doping on the structural, magnetic and dielectric properties of strontium hexaferrite nanomaterials. J. Magn. Magn. Mater., 2011, 323(3-4): 259.