J. Phys. IV France 123 (2005) 291-294
Magnetic approach in some mixed Cobalt (II) hydroxynitrates compoundsN. Izaoumen1, M. Cherrab1, K. Rissouli1, K. Benkhouja1, K. Jaafari1 and M. Fahad2
1 LMCM, Département de Chimie, Faculté des Sciences, Université Chouaib Doukkali, BP. 20, 24000 Eljadida, Maroc
2 LPTN, Département de Physique, Faculté des Sciences, Université Chouaib Doukkali, BP. 20, 24000 Eljadida, Maroc
Among layered compounds, the transition metal hydroxynitrates M(OH) (NO .nH2O (with M= Co, Ni,Cu) are still currently investigated, since they are good precursors for the synthesis of simple or mixed metal oxides with interesting catalytic and electronic properties.From a structural point of view, the hydroxynitrates derive from the CdI2 type stucture of M (OH)2. They can be described as 2D triangular arrays of metal ions with large interplanar distances, and accordingly, they are good candidates for studying bidimensional magnetic systems. Knowing that from a magnetic point view, Co(OH)2 and Co2(OH)3(NO3) were shown to be a genuine examples of layered ferromagnetic systems, with the occurrence of 3d antiferromagnetic order at nearly the same temperature ; we report in this paper the preparation and magnetic properties of layered cobat mixed metal(II) hydroxynitrates CoM(OH)3(NO3) (M= Cu, Ba) hydrated or no which display, according to the metal ion, either ferro or antiferromagnetic interlayer interactions. We discuss the interest in these compounds named hybrid organic-inorganic compounds for the stabilizing ferromagnetic interactions.
© EDP Sciences 2005