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Synthesis, microstructure and oxidation of Co-MgAl2O4 and Ni-MgAl2O4 nanocomposite powders

Quénard, Olivier and Laurent, Christophe and Brieu, Marc and Rousset, Abel Synthesis, microstructure and oxidation of Co-MgAl2O4 and Ni-MgAl2O4 nanocomposite powders. (1996) Nanostructured Materials, 7 (5). 497-507. ISSN 0965-9773

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Official URL: http://dx.doi.org/10.1016/0965-9773(96)00026-8

Abstract

MgAl2O4-CoAl2O4 and MgAl2O4-NiAl2O4 solid solutions are synthesized by combustion in urea of the appropriate metal nitrates. The selective reduction in hydrogen of these oxides gives rise to a dispersion of nanometric Co or Ni particles in the spinel matrix. The reduction of the Co2+ and Ni2+ ions is complete at 900 and 1000 °C respectively. Owing to the homogeneity of the starting oxide solid solution, the size distribution of the metal particles is narrow and their average size is about 10 nm. During a thermal treatment in air, the nanometric metal particles located in the open porosity of the matrix are totally oxidized at temperatures lower than 700 °C, whereas those dispersed inside the matrix grains are stable up to 900 °C. These latter particles account for more than half of the total metal content.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Nanostructured Materials website : http://www.sciencedirect.com/science/article/pii/0965977396000268?via=ihub
Audience (journal):International peer-reviewed journal
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Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:27 Mar 2014 14:03

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