Abstract
Ni1−x Co x Fe2O4 nanoparticles with x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5 (named NC0, NC10, NC20, NC30, NC40, and NC50, respectively) were synthesized by wet chemical co-precipitation method. The prepared nanoparticles were crystallized in the cubic spinel structure of space group Fd3m with a narrow size distribution from 13 to 24 nm. The saturation magnetization was strongly influenced with Co2+ concentrations. The cation distribution, the spin canting, and the presence of Fe2+ ions along with Fe3+ ions were responsible for the variation in saturation magnetization. Cation distribution estimated from saturation magnetization suggested the mixed spinel structure of Ni1−x Co x Fe2O4 system. The calculated g values from electron spin resonance spectra were consistent with the variation of saturation magnetization. UV–vis diffuse spectra indicated that Ni1−x Co x Fe2O4 samples were indirect band gap materials and band gap decreased with increasing Co2+ concentration. Dielectric constant and dielectric loss showed frequency-dependent dispersion along with enhancement dielectric constant with increasing Co2+ concentration. The complex impedance analysis confirmed that the conduction process predominantly takes place through grain boundaries.
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Joshi, S., Kumar, M. Influence of Co2+ Substitution on Cation Distribution and on Different Properties of NiFe 2 O 4 Nanoparticles. J Supercond Nov Magn 29, 1561–1572 (2016). https://doi.org/10.1007/s10948-016-3442-1
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DOI: https://doi.org/10.1007/s10948-016-3442-1