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Synthesis and magnetic properties of nano-dimensional Fe1-xCuxAl2O4 (0.3 ≤ x ≤ 0.8)

Abstract : Here we report, the sol-gel synthesized, microstructural analysis, surface and magnetic properties of solid solutions of Fe1-xCuxAl2O4. The singular phase of the samples for x values varied between 0.3 and 0.8 at 700 °C has been obtained. The powder X-ray diffraction, electron diffraction and HRTEM analysis reveal that the particle size systemically increases with the increase in x value. The XPS studies have confirmed the presence of Cu2+ species with a (Fe + Cu)/Al surface atomic ratio close to the bulk stoichiometric value. Unlike the common magnetic spinels with B-site magnetic cations, Fe1-xCuxAl2O4 shows only A-site magnetism in a diamond-type lattice. The samples with smaller particle size, namely the samples for x = 0.3 and 0.4 exhibit small magnetization. The origin of such magnetism is attributed to the inversion in the spinel structure and the defect induced magnetism. Except for the x = 0.7 sample, all other samples show spin glass behavior. © 2015 The Royal Society of Chemistry.
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S. Maiti, A.K. Kundu, O.I. Lebedev, P. Bera, C. Anandan, et al.. Synthesis and magnetic properties of nano-dimensional Fe1-xCuxAl2O4 (0.3 ≤ x ≤ 0.8). RSC Advances, Royal Society of Chemistry, 2015, 5 (102), pp.83809-83817. ⟨10.1039/c5ra14623b⟩. ⟨hal-02184187⟩



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