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Structural, Magnetic, and Reflection Loss Characteristics of Ni/Co/Sn-Substituted Strontium Ferrite/Functionalized MWCNT Nanocomposites

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Abstract

Ni/Co/Sn-substituted strontium ferrite [SrFe12−x (Ni0.5Co0.5Sn) x/2O19]/multiwalled carbon nanotube (MWCNT) nanocomposites were produced by assembling ferrite particles on the external surfaces of MWCNTs. Various techniques including x-ray diffraction (XRD) analysis, transmission electron microscopy, field-emission scanning electron microscopy (FE-SEM), and Fourier-transform infrared (FTIR) spectroscopy were used to demonstrate the successful attachment of ferrite particles onto the external surfaces of the MWCNTs. XRD analysis and FTIR spectroscopy confirmed the presence of strontium ferrite and carbon nanotube phases in ferrite and nanocomposite samples, respectively. FE-SEM micrographs indicated the formation of ferrite particles on the outer surfaces of MWCNTs in nanocomposite samples. Furthermore, vibrating-sample magnetometer (VSM) and reflection loss (RL) measurements were performed to assess the magnetic and microwave characteristics of the synthesized samples. VSM loops confirmed a relatively strong dependence of the saturation magnetization and coercivity on the volume percentage of MWCNTs. With the introduction of MWCNTs or an increase in the substitution, the saturation magnetization and coercivity were decreased. The RL properties of the nanocomposites were investigated in the 8 GHz to 12 GHz frequency range. The sample with 80 wt.% nanocomposite content showed a maximum RL of −35 dB at 8.3 GHz with a 4 GHz absorption bandwidth over the extended frequency range of 8 GHz to 12 GHz for absorber thickness of 1.8 mm. The RL evaluations indicated that these nanocomposites have high potential for application as wide-band electromagnetic wave absorbers at GHz frequencies.

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Authors and Affiliations

  1. Department of Materials Engineering, Malek Ashtar University of Technology, Shahin Shahr, Isfahan, Iran

    Mohammad Mousavinia, Ali Ghasemi & Ebrahim Paimozd

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  1. Mohammad Mousavinia
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  2. Ali Ghasemi
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  3. Ebrahim Paimozd
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Correspondence to Mohammad Mousavinia.

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Mousavinia, M., Ghasemi, A. & Paimozd, E. Structural, Magnetic, and Reflection Loss Characteristics of Ni/Co/Sn-Substituted Strontium Ferrite/Functionalized MWCNT Nanocomposites. J. Electron. Mater. 43, 2573–2583 (2014). https://doi.org/10.1007/s11664-014-3120-7

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  • DOI: https://doi.org/10.1007/s11664-014-3120-7

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