Abstract
The cobalt-substituted copper zinc ferrite (Cu0.3Zn0.7−xCoxFeAlO4, CZC ferrite) was chemically synthesized by the sol−gel methodology. The phase identification, crystal structure change confirmation, morphology analysis, and magnetic evolution of samples have been studied. The X-ray diffraction and vibrating sample magnetometer (VSM) were used for structural and magnetic studies of the prepared CZC ferrite samples. The cation distribution carried out from X-ray analysis confirms the occupancy of Fe3+, Zn2+ and Cu2+ on tetrahedral sites and Fe3+, Cu2+, Al3+ and Co2+ on octahedral sites in the crystal lattice. The spherical-shaped nanoparticles of 22−32 nm were observed from TEM images, and the nanocrystallinity of particles was confirmed from HRTEM. Hysteresis curves of the CZC demonstrate modifications in coercivity, magnetization and magnetic remanence with Co2+ ions doping in CZC systems. All the samples show soft magnetic behavior. For x = 0.3, lower values of Hc and Mr indicate super-paramagnetic nature. The dielectric behavior of CZC system was analyzed with frequency variation of real and imaginary portion of dielectric constant. The effects of multi-elementals like Cu, Zn, Co, and Al on ferrite are studied in this paper. The transition of ferrite from ferrimagnetic to superparamagnetic is observed in this study.
Highlights
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The cobalt-substituted copper zinc ferrite was prepared by the sol−gel auto-combustion method.
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The cobalt-substituted copper zinc shows transition from ferrimagnetic to superparamagnetic.
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The coercivity and remanence approaches very low values, showing superparamagnetic nature of the sample.
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Navgare, D.L., Kawade, V.B., Tumberphale, U.B. et al. Superparamagnetic cobalt-substituted copper zinc ferrialuminate: synthesis, morphological, magnetic and dielectric properties investigation. J Sol-Gel Sci Technol 93, 633–642 (2020). https://doi.org/10.1007/s10971-019-05106-z
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DOI: https://doi.org/10.1007/s10971-019-05106-z