- Cited by 9
Ahn, Woo Jin Jung, Hyo Seung and Choi, Hyoung Jin 2015. Pickering emulsion polymerized smart magnetic poly(methyl methacrylate)/Fe2O3composite particles and their stimulus-response. RSC Adv., Vol. 5, Issue. 29, p. 23094.
Hu, Lin Zhang, Ruirui and Chen, Qianwang 2014. Synthesis and assembly of nanomaterials under magnetic fields. Nanoscale, Vol. 6, Issue. 23, p. 14064.
Rahman, Md. T. Vargas, M. and Ramana, C.V. 2014. Structural characteristics, electrical conduction and dielectric properties of gadolinium substituted cobalt ferrite. Journal of Alloys and Compounds, Vol. 617, p. 547.
Sivakumar, P. Ramesh, R. Ramanand, A. Ponnusamy, S. and Muthamizhchelvan, C. 2013. Synthesis and characterization of NiFe2O4 nanoparticles and nanorods. Journal of Alloys and Compounds, Vol. 563, p. 6.
Vereda, F. de Vicente, J. and Hidalgo-Alvarez, R. 2013. Oxidation of ferrous hydroxides with nitrate: A versatile method for the preparation of magnetic colloidal particles. Journal of Colloid and Interface Science, Vol. 392, p. 50.
Wells, S. and Ramana, C.V. 2013. Effect of hafnium-incorporation on the microstructure and dielectric properties of cobalt ferrite ceramics. Ceramics International, Vol. 39, Issue. 8, p. 9549.
Sivakumar, P. Ramesh, R. Ramanand, A. Ponnusamy, S. and Muthamizhchelvan, C. 2012. Structural, thermal, dielectric and magnetic properties of NiFe2O4 nanoleaf. Journal of Alloys and Compounds, Vol. 537, p. 203.
Cao, Xiaohui Meng, Jinhong Mi, Fei Zhang, Zhenghua and Sun, Jie 2011. Preparation and magnetic property investigation of a nickel spinel ferrite-coated tetrapod-like ZnO composite. Solid State Communications, Vol. 151, Issue. 9, p. 678.
Vereda, Fernando de Vicente, Juan and Hidalgo-Álvarez, Roque 2009. Physical Properties of Elongated Magnetic Particles: Magnetization and Friction Coefficient Anisotropies. ChemPhysChem, Vol. 10, Issue. 8, p. 1165.
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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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