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Characterization and Investigation of Magnetic and Microwave Properties of Al–Cr-Substituted Z-Type Barium Hexaferrite Nanoparticles

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Abstract

Aluminium-and chromium-substituted Z-type hexaferrite nanoparticles with a composition of Ba3 Co1.8Mn0.066Ni0.066Cu0.066Fe24−2y Al y Cr y O41 (y = 0–0.8 in a step of 0.2) were prepared by a co-precipitation-assisted solid-state synthesis method. The effect of Al 3+ and Cr 3+ cation substitution on the structural, magnetic and microwave absorption properties of Z-type barium hexaferrite nanoparticles was investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM) and vector network analysis. The XRD patterns showed that the main peak intensities were corresponded to Co2Z phase as a main phase in addition to M and Co2Y-type as impurity phases. The lattice parameters (a and c) obtained from XRD data decrease with an increase in content y. SEM micrographs showed that the particle size is in the range of 50–300 nm. The FT-IR spectra also indicated that there were two bands characterizing ferrites in the range of 430–590 cm −1. They were identified as the metal–oxygen stretching vibrations of Ba-Z hexaferrite. The results of hysteresis loops indicated that with increasing amount of dopant from y = 0. to y = 0.4, the saturation magnetization and coercivity increased from 60 emu/g and 1306 Oe to 73 emu/g and 1850 Oe, respectively. In addition, it can be seen that the maximum reflection loss of substituted hexaferrite is −37 dB at a frequency of 9.9 GHz with an absorption bandwidth of 4.5 GHz (reflection loss more than −20 dB). As a result, it was found that Al–Cr-doped Z-type hexaferrite can be proposed as suitable absorbers for applications in microwave technology with a good deal of consistency.

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Authors and Affiliations

  1. Department of Materials Engineering, Malek Ashtar University of Technology, Shahinshahr, Esfahan, Iran

    Mohammad Javad Pourhosseini asl, Ali Ghasemi & Gholam Reza Gordani

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  1. Mohammad Javad Pourhosseini asl
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  2. Ali Ghasemi
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  3. Gholam Reza Gordani
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Correspondence to Mohammad Javad Pourhosseini asl.

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Pourhosseini asl, M.J., Ghasemi, A. & Gordani, G.R. Characterization and Investigation of Magnetic and Microwave Properties of Al–Cr-Substituted Z-Type Barium Hexaferrite Nanoparticles. J Supercond Nov Magn 29, 795–801 (2016). https://doi.org/10.1007/s10948-015-3337-6

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  • DOI: https://doi.org/10.1007/s10948-015-3337-6

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