Effect of Nd Substitution on Magnetic and Microwave Absorption Properties of Nanocrystalline Sr(MnSn)0.5Fe11O19
Javad-Mola Verdi Khani,
The preparation of Sr1-xNdx(MnSn)0.5Fe11O19 M-type hexaferrites powders by a citrate sol-gel method was investigated.
The samples were determined by X-ray diffraction (XRD) and transmission electron microscope (TEM). Microwave
absorption properties of hexaferrite- acrylic resin composites were measured using SWR (standing-wave-ratio)
method in the range of 12 to 20 GHz. It was shown that small amounts of Nd+3 substitution could significantly modify the
microwave electromagnetic parameters. Furthermore, the investigation indicated that substitution of Nd+3 ions for Sr+2
ions in Sr(MnSn)0.5Fe11O19 resonant frequency would move toward higher frequency. The results showed that the powder
possesses excellent microwave absorption properties. A minimum reflection loss of 43 dB was observed for the composite,
where x = 0.03. A broad bandwidth of microwave absorption (with a 10 dB reflection loss as a reference) is predicted
in the composite samples containing the ferrite powders of x=0.02, and x=0.03 in Ku-band frequencies.
Keywords: Chemical synthesis, magnetic materials, magnetic properties, nano crystalline materials.
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