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M-Type Strontium Hexaferrite Nanoparticles Prepared by Sol-Gel Auto-combustion Method: The Role of Co Substitution in Structural, Morphological, and Magnetic Properties

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Abstract

In this work, the sol-gel auto-combustion method has been successfully used to prepare nanocrystalline strontium hexaferrite doped with cobalt at iron sites (SrFe12−x Cox O 19, x = 0–1). The crystal structure, morphology, and magnetic properties of samples were systematically investigated using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM), respectively. The three vibrational modes were observed in the FT-IR spectra of calcined samples, which indicated the presence of metal-oxygen stretching bands in hexaferrite structure after calcination treatment. The XRD results confirmed the single-phase M-type hexagonal structure for SrFe12−x Cox O 19 samples with x≤ 0.5; however, for the samples with x> 0.5, the cubic CoFe2 O 4 phase was also appeared. The average particle size determined by TEM analysis was found to be about 87 nm (for x = 0) and 110 nm (for x = 1) whereas the cobalt substitution leads to the larger particles. The saturation magnetization increased with cobalt content up to x = 0.5 and then decreased slowly on further increase of the dopant concentration, while the coercivity decreased continuously with increasing Co content.

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Acknowledgments

The authors would like to thank the “Iranian Nanotechnology Initiative Council” for their financial support.

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Authors and Affiliations

  1. Magnetism and Superconducting Research Laboratory, Department of Physics, University of Birjand, P.O. Box 97175-615, Birjand, Iran

    Ebrahim Roohani, Reza Sarhaddi & Saeedeh Sudkhah

  2. Department of Physics, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran

    Hadi Arabi

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  1. Ebrahim Roohani
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  2. Hadi Arabi
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Correspondence to Ebrahim Roohani.

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Roohani, E., Arabi, H., Sarhaddi, R. et al. M-Type Strontium Hexaferrite Nanoparticles Prepared by Sol-Gel Auto-combustion Method: The Role of Co Substitution in Structural, Morphological, and Magnetic Properties. J Supercond Nov Magn 30, 1599–1608 (2017). https://doi.org/10.1007/s10948-016-3966-4

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