Abstract
Different divalent cation substituted Co-ferrite (MXCo1−XFe2O4, where M = Mg2+, Ni2+, Cu2+, Zn2+, with x = 0.20 and 0.75) nanoparticles were synthesized by sol–gel method and were annealed at 900 °C in air. After annealing, grain growth was observed for all the samples. With the substitution of Mg2+, Ni2+ and Cu2+ with x = 0.20, the magnetization of the as-prepared and the annealed samples was decreased from that of the Co-ferrite whereas Zn2+ substitution enhanced the magnetization. The highest magnetization values of 79.9 and 92.9 emu/g at 300 and 60 K respectively were observed for the Zn2+ substituted annealed sample with x = 0.20. For higher concentration of x = 0.75, the magnetization value was further decreased in all the samples and the lowest magnetization value of 5.1 emu/g was observed in the Zn2+ substituted annealed sample with x = 0.75 at 300 K. The coercivity was reduced in the samples except for the Cu2+ substituted sample. In the Cu2+ substituted sample with x = 0.75, the highest coercivity of 1.43 kOe at 300 K was observed after annealing. The changed cation distribution in the spinel structure, ionic magnetic moment and anisotropy compared to the Co2+ in these nanomaterials can explain the observed magnetic properties.
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S.C. Sahoo thanks UGC, Govt. of India for partial financial support through a Grant Number F.20-3(8)/2012(BSR) for this work.
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Chithra, M., Anumol, C.N., Argish, V. et al. Tailoring magnetic properties of cobalt ferrite nanoparticles by different divalent cation substitution. J Mater Sci: Mater Electron 29, 813–822 (2018). https://doi.org/10.1007/s10854-017-7976-1
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DOI: https://doi.org/10.1007/s10854-017-7976-1