Skip to Main content Skip to Navigation
Journal articles

Synthesis and characterization of Fe/Co/Ni alloys-MgO nanocomposite powders

Abstract : A mixed oxalate β-Mg 0.896 Fe 0.047 Co 0.034 Ni 0.023 C 2 O 4 ·2H 2 O of well controlled size and morphology was prepared by coprecipitation. The corresponding quaternary solid solution between MgO, FeO, CoO and NiO was prepared by thermal decomposition and calcination in a H 2 /H 2 O/N 2 atmosphere. The selective reduction of the solid solution in an H 2 atmosphere was studied by a combination of X-ray diffraction, Mössbauer spectroscopy, transmission electron microscopy and associated analysis. This work has brought to light the very high stability of Fe 2+ , Co 2+ and notably Ni 2+ when substituted for Mg 2+ in the MgO rocksalt lattice. It is necessary to perform the reduction at 1300 °C fully to reduce the transition metal ions. The alloy particles are either distributed as relatively large particles (tens to hundreds of nanometers) at the surface of the MgO grains or as much smaller particles (≤20 nm) probably located inside the matrix grains and epitaxial with it. The composition distribution of the large surface particles is fairly broad when the reduction was performed at 1100 and 1300 °C. In contrast, it is much narrower in the powder prepared by reduction at 1200 °C, although the particles are still low in Ni compared to the target composition.
Document type :
Journal articles
Complete list of metadata

Cited literature [8 references]  Display  Hide  Download
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Monday, January 12, 2015 - 3:37:18 PM
Last modification on : Friday, January 10, 2020 - 9:08:22 PM
Long-term archiving on: : Monday, April 13, 2015 - 11:00:48 AM


Files produced by the author(s)




Valérie Baco-Carles, Christophe Laurent, Marc Brieu, Abel Rousset. Synthesis and characterization of Fe/Co/Ni alloys-MgO nanocomposite powders. Journal of Materials Chemistry, Royal Society of Chemistry, 1999, vol. 9 (n° 4), pp. 1003-1009. ⟨10.1039/a809642b⟩. ⟨hal-01102345⟩



Record views


Files downloads