Abstract
Introduction:The copper doped cobalt ferrite series, with nominal formula CuXCo1-XFe2O4(X = 0, 0.25, 0.5, 0.75, 1), has been elaboratedviasol-gel autocombustion process by copper substitution procedure into cobalt ferrite framework.Methods:The five synthesized ferrites have been analyzed by X-ray powder diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy coupled to energy dispersive X-ray spectroscopy, complex impedance spectroscopy and superconducting quantum interference device magnetometry.Results and Discussion:The analysis of the results allowed to deduce that the cubic spinel basic structure was not modified by the incorporation of copper into the host lattice and the corresponding pure fine powders obtained formed by homogeneous nanoparticles. The highest electrical conductivity value, σDC(373K) = 27.03x10-3S.cm-1, was observed in the case of CuFe2O4.Conclusion:Moreover, the superparamagnetic behavior at room temperature has been confirmed by using both ZFC-FC and hysteresis magnetic measurement modes. In addition, the remarkable electrical conductivity and magnetic properties of the five explored nanoferrites, derived from the present investigation, enabled them useful in several modern nanotechnological and biomedical applications.
Highlights
IntroductionThe cubic inverse spinel basic structure of cobalt ferrite has collinear ferromagnetic properties which are induced by the presence of permanent moment generated by antiparallel spins between Fe3+ and Co2+ cations, which are located at tetrahedral A-sites and octahedral B-sites, respectively
The copper doped cobalt ferrite series, with nominal formula CuXCo1-XFe2O4 (X = 0, 0.25, 0.5, 0.75, 1), has been elaborated via sol-gel autocombustion process by copper substitution procedure into cobalt ferrite framework
In case of NiXCo1-XFe2O4(X = 0.2, 0.8) series, the lattice parameters decrease with the increase of Ni2+ composition and the change of preparation method from the sol-gel autocombustion to the coprecipitation leads to the decrease of lattice parameters and the increase of crystallite size and density [14]
Summary
The cubic inverse spinel basic structure of cobalt ferrite has collinear ferromagnetic properties which are induced by the presence of permanent moment generated by antiparallel spins between Fe3+ and Co2+ cations, which are located at tetrahedral A-sites and octahedral B-sites, respectively. The substitution of Co2+ by Al3+ within the CoFe2O4 cubic inverse spinel basic structure causes a decrease in the particle size and saturation magnetization, whereas the chromium substituted cobalt ferrite nanoparticle series CrXCoFe2-XO4(0 ≤ X ≤ 1) exhibits an excellent improvement in the structural and magnetic properties. In case of NiXCo1-XFe2O4(X = 0.2, 0.8) series, the lattice parameters decrease with the increase of Ni2+ composition and the change of preparation method from the sol-gel autocombustion to the coprecipitation leads to the decrease of lattice parameters and the increase of crystallite size and density [14]
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