Abstract
Gd, Mn and Co substituted barium hexagonal ferrite nanoparticles, according to the formula Ba1−x Gd x Fe12−2y (MnCo) y O19 and the proportion of \( y = \frac{x}{2} \) (and x = 0, 0.1, 0.3, 0.5, 0.7, 0.9, 1), have been prepared by hydrothermal method. Structural, magnetic and absorption microwave properties of the compositions were evaluated by x-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), vibrating sample magnetometry, and vector network analysis. Studying the XRDs data showed the single-phase structure of all samples without any impurities at 900°C calcination temperature. FE-SEM micrographs demonstrated that the morphology of the nanoparticles has planar and nearly hexagonal morphology. The nanoparticles size calculated within the range of 62–85 nm. Study of the room temperature hysteresis loops of calcined samples indicated that maximum magnetizations and coercivities decreased compared to undoped composite with respect to x. The alterations of magnetizations and coercivities are related to the site occupation of substituted ions, change in grain growth inhibition and the effect of spin canting. Moreover, the results of microwave absorption measurements demonstrated that the maximum reflection loss of substituted Ba-hexaferrite equivalent to − 47 dB in sample x = 0.5 with thickness 5.6 mm at a frequency about 17.2 GHz and a bandwidth of 2 GHz greater than − 10 dB. The results showed that Gd has good potential for use as a rare-earth substitution in permanent magnet hexaferrites and these composites can be employed as absorbers in the gigahertz frequency range.
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Torabi, Z., Arab, A. & Ghanbari, F. Structural, Magnetic and Microwave Absorption Properties of Hydrothermally Synthesized (Gd, Mn, Co) Substituted Ba-Hexaferrite Nanoparticles. J. Electron. Mater. 47, 1259–1270 (2018). https://doi.org/10.1007/s11664-017-5889-7
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DOI: https://doi.org/10.1007/s11664-017-5889-7