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Synthesis of Ni ferrite and Co ferrite rodlike particles by superposition of a constant magnetic field

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Abstract

We report the fabrication of micron-sized rodlike particles of nonstoichiometric Co and Ni ferrites by aging coprecipitated Fe(OH)2 and M(OH)2—where M is either Ni or Co—at 90 °C in the presence of an external magnetic field (B ≈ 405 mT). Potassium nitrate was used as a mild oxidant. Resultant particles were analyzed by means of electron microscopy, x-ray powder diffraction (XRD), magnetometry, energy dispersive x-ray (EDX) spectrometry, and atomic absorption spectroscopy. Rodlike particles of both types of ferrite exhibited a relatively uniform thickness, an average aspect ratio close to 10, and have a spinel crystalline structure. EDX spectrometry and atomic absorption spectroscopy confirmed the incorporation of Ni2+ and Co2+ in the respective ferrite particles. The incorporation of Co2+ led to non-negligible remanence and coercivity. The incorporation of Ni2+ led to a lower saturation magnetization, whereas the remanence and coercivity of the Ni ferrite were very low, still typical of a soft ferrimagnetic material. The mechanism of formation of the rodlike particles was investigated by the time-dependent observation of growing Ni ferrite rods.

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Acknowledgments

This work was supported by project MEC MAT-2006-13646-C03-03 (Ministerio de Educación y Ciencia, Spain) by the “European Regional Development Fund” (ERDF) and by projects FQM 392 and P07-FQM-2496 (Junta de Andalucía, Spain). The authors are especially grateful to Francisco Galisteo-González, for providing the software used for the generation of particle size distributions from SEM and TEM micrographs.

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  1. Grupo de Física de Fluidos y Biocoloides, Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Granada, Granada, E-18071, Spain

    Fernando Vereda, Juan de Vicente & Roque Hidalgo-Álvarez

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  1. Fernando Vereda
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  2. Juan de Vicente
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  3. Roque Hidalgo-Álvarez
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Correspondence to Fernando Vereda.

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Vereda, F., de Vicente, J. & Hidalgo-Álvarez, R. Synthesis of Ni ferrite and Co ferrite rodlike particles by superposition of a constant magnetic field. Journal of Materials Research 23, 1764–1775 (2008). https://doi.org/10.1557/JMR.2008.0218

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