Abstract
Nanocrystalline Ni x Zn1−x Fe2O4 (0 ≤ x ≤ 1) ferrite powders with average particle size 15–20 nm have been successfully prepared at a very low temperature (180 °C) by a novel auto combustion process using citric acid and ethylenediamine as a coordinating agent and bridging ligand, respectively. Phase purity of the solid solutions has been confirmed by X-ray diffraction. Morphological characterizations of the prepared samples were performed by high resolution transmission electron and field emission scanning electron microscopy. Extensive Fourier transformed infrared spectroscopic characterization has been carried out to identify the plausible mechanism of the synthesis process. Composition-dependent electrical properties (resistivity and dielectric constant) of the synthesized solid solution have been investigated. Interestingly, a non-linear variation of dielectric permittivity with respect to composition has been observed. The room temperature electrical resistivity as well as the dielectric permittivity of Ni0.5Zn0.5Fe2O4 was found to decrease with the decrease of particle size.
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Acknowledgments
K. Bhattacharjee wishes to thank the University Grants Commission (UGC), the Government of India for financial assistance under the University with the “potential for excellence” programme.
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Bhattacharjee, K., Ghosh, C.K., Mitra, M.K. et al. Novel synthesis of Ni x Zn1−x Fe2O4 (0 ≤ x ≤ 1) nanoparticles and their dielectric properties. J Nanopart Res 13, 739–750 (2011). https://doi.org/10.1007/s11051-010-0074-4
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DOI: https://doi.org/10.1007/s11051-010-0074-4