Abstract
Substituted strontium hexaferrite nanoparticles with the chemical formula SrFe12−x (MnSn0.5Ti0.5) x/2O19(x = 0–2.5, in a step of 0.5) were prepared by a sol–gel method. Phase identities and crystal structure of the synthesized nanoparticles were investigated by x-ray diffraction. The morphology of the nanopowders was determined by field emission scanning electron microscopy. Results obtained from Fourier-transform infrared spectroscopy revealed the presence of stretching and bending modes in the citrate complex. Mössbauer spectroscopy (M S) revealed occupancy of the hexagonal lattice structure by non-magnetic Mn2+ –Sn4+ –Ti4+ cations. Magnetic properties were measured by use of a vibrating sample magnetometer. The results showed that saturation magnetization and coercivity decreased with increasing x content. Microwave absorption properties were investigated by use of a vector network analyzer. It was found that the maximum reflection loss of substituted Sr-ferrite 1.6 mm thick reached −41.8 dB at a frequency of 4.3 GHz and a bandwidth of 7.5 GHz, with reflection loss being higher than −25 dB. These results imply that the prepared composites are good candidates for absorbers in the gigahertz frequency range.
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Jamalian, M., Ghasemi, A. & Paimozd, E. Sol–Gel Synthesis of Mn–Sn–Ti-Substituted Strontium Hexaferrite Nanoparticles: Structural, Magnetic, and Reflection-Loss Properties. J. Electron. Mater. 43, 1076–1082 (2014). https://doi.org/10.1007/s11664-014-2984-x
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DOI: https://doi.org/10.1007/s11664-014-2984-x