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Garcia-Cerda L.A.,Research Center en Quimica Aplicada | Bernal-Ramos K.M.,University Autnoma Of Coahuila | Montemayor S.M.,University Autnoma Of Coahuila | Quevedo-Lopez M.A.,University of Texas at Dallas | And 2 more authors.
Journal of Nanomaterials | Year: 2011

The preparation and characterization of hcp and fcc Ni and Ni/NiO nanoparticles is reported. Ni and Ni/NiO nanoparticles were obtained starting from a precursor material prepared using a citric assisted Pechini-type method and, then, followed by a calcination of the precursor in air at either 400 or 600C for different times. The precursor was analyzed using thermogravimetric and differential thermal methods (TGA-DTA), and the resulting nanoparticles were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and vibrational sample magnetometry. Nanoparticles showed a phase transformation for Ni from hcp to fcc and/or to fcc NiO structure as the calcination time increased. The influence of the phase transition and the formation of NiO on the magnetic properties of the samples are discussed. © 2011 L. A. Garca-Cerda et al.

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