Structural and Magnetic Properties of Spinel Nickel-Cobalt Ferrite Nanoparticles Substituted by Dysprosium Cation Synthesized by Hydrothermal Method

S. Balideh, A. Aavazpour, G. Rezaei, A. Nikzad Department of Physics, University of Yasouj, Yasouj, 75918-74934, Iran

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Dysprosium-doped nickel-cobalt ferrite nanoparticle samples of the chemical formula Ni0.3Co0.7DyxFe2-xO4 (x=0.0, 0.02, 0.04, 0.06, 0.08, and 0.1) were synthesized by the hydrothermal method followed by an annealing treatment and using NaOH as a solvent. The synthesized samples were annealed at 150° for 7 h. The influence of Dy doping on structural, morphological, electrical and magnetic properties was studied. The structure, size, morphology, and magnetic properties of synthesized compounds were investigated by using X-ray diffraction, the Fourier transform infrared spectroscopy, the field emission scanning electron microscopy, an energy dispersive spectrometer and a vibrating sample magnetometer (VSM). The formation of a ferrite phase was confirmed by X-ray diffraction. An increase in the average crystallite and grain size has been observed with an increase in Dy doping. The Fourier transform infrared spectra showed two characteristic strong absorption bands at 500-600 cm-1. The field emission scanning electron microscopy analysis showed a regular spherical shape and particles with an average size ranging from 45 nm to 60 nm. By studying the energy dispersive spectrometer analysis patterns, the existence of constituent elements, Co, Ni, Fe, and Dy, was verified with the proportion very close to the stoichiometry of the chemical formula. Magnetic measurements confirmed the typical magnetic behavior of spinel ferrite nanoparticles and magnetic hysteresis behavior was improved as compared to earlier reports.

DOI:10.12693/APhysPolA.140.14 topics: nanoferrite, nickel-cobalt, dysprosium, magnetic properties