par Duvigneaud, Paul-Henri 
;Coussement, Ann
Référence Journal of solid state chemistry, 52, 1, page (22-31)
Publication Publié, 1984-03
;Coussement, Ann Référence Journal of solid state chemistry, 52, 1, page (22-31)
Publication Publié, 1984-03
Article révisé par les pairs
| Résumé : | Rutile-type dioxides of titanium and ruthenium form partial solid solutions at temperatures above 1000°C, whereas the miscibility is complete in the temperature range of 350-600°C, when the oxides are coated on titanium or alumina substrates. The present work tends to show that the RuxTit-xO2 coatings are metastable solutions wherein the chloride ions are likely to replace the oxide ions on the sublattice O2- sites. The increase of a and c parameters in the overall composition range are compatible with a Cl/Ru ratio of 2.5 at.% in the rutile lattice. This ratio does not depend upon the titanium content and therefore it is thought that the Cl- ions are compensated by reduced Ru3+ (or Ti3+) species. The electrical conductivity retains its metal-like characteristics in the composition range of 30-100% RuO2, this is accounted for by the existence of RuO π* bands along (110) directions. The reduced ions in equilibrium with Cl- would provide additional paths for electron transport along the c-axis, explaining the high values of conductivity in the concentration range of 30-50% RuO2. © 1984. |
