Reactivity of H2S and H2S/H2 Mixture With Molybdenum Oxide Thin Films Epitaxied on CoO (100) : Characterization by Rheed and Auger Spectroscopy

Molybdenum-Cobalt composite oxide films were prepared by the evaporation of molybdenum trioxide on a fresh cleaved CoO (100) surface (Thickness = 10 A). The MoO3-CoO interface has been characterized simultaneously by reflexion high electron diffraction (RHEED) and Auger Electron Spectroscopy (AES). The thin film structure and composition depend on the annealing temperature. After a 300°C treatment, metallic cobalt islands nucleate at the interface thin film - CoO (100) and crystallize with the cubic FCC symmetry. After a 700°C treatment cobalt molybdate (a CoMoO4) islands grow. The metastable crystallites are epitaxied on CoO (100). After a 900°C treatment, the thin film consists of flat tw…

Étude expérimentale de la conductivité électrique du molybdate de COBALT CoMoO4

La conductivite electrique du molybdate de cobalt CoMoO4 a ete mesuree dans le domaine de temperature 100-600 °C, a partir d'echantillons pulverulents sous forme de pastille. Il a ete trouve que la variete a-CoMoO4 est un semi-conducteur de type p, tandis que la variete b-CoMoO4 est un semi-conducteur de type n.Differents mecanismes de conduction ont ete trouves en fonction de la variete polymorphique de CoMoO4 et de la pression partielle d'oxygene. Leur nature est discutee.

Chemical Transport of Mg and Al in Thin Foils of Nickel Alloys