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M. A. Almessiere,Y. Slimani,A.V. Trukhanov,A. Baykal,H. Gungunes,E.L. Trukhanova,S.V. Trukhanov,V.G. Kostishin 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.90 No.-
The dysprosium ions (Dy3+)-substituted nanosized ferrites (NFs) of composition [Ni0.5Co0.5](DyxFe2-x)O4(x0.08) were prepared using the citrate gel process. To analyse the magnetic properties of the samples,the Mössbauer spectroscopy methods and vibrating sample magnetometry (VSM) were applied. Theroom temperature Mössbauer spectra werefitted to determine the hyperfine parameters of the proposedNFs. The preferential occupation of the octahedral B sites by the Dy3+ in the spinel ferrite sublattice wasconfirmed from the cations distribution. The hyperfine magneticfield of both sublattice decreasedwhereas the increase in the Dy3+ substitution was observed. The S-parameters of the prepared NFs in thehigh frequency range were measured by the co-axial method. In addition, the MW reflection losses wereevaluated by means of the frequency-dependent (in the range of 1–20 GHz) complex permittivity andpermeability spectra. All the NFs indicated that the absorption of the electromagnetic radiation wasranging between 2.9–5.5 GHz due to the natural ferromagnetic resonance. A correlation amongst the Dy3+ concentration, microstructure, magnetic and microwave (MW) characteristics of these NFs wasestablished. It’s been asserted that by controlling the Dy3+ contents carefully, the MW absorption andmagnetic attributes of the proposed spinel NFs can be tailored.