Etude des solutions solides "Ce LnO 3" et des perovskites Ce LnO 3 et PrLn O3 (Ln = él ément lanthanidique )
Interlanthanide perovskites CeTmO 3, CeYbO 3, CeLuO 3, PrYbO 3, PrLuO 3, and Ce LnO 3 solid solutions have been prepared by cofusion techniques. Thermal stability and the optical properties of these materials have been investigated. A very important nephelauxetic effect ( ∆E = 3600 cm -1) is observed. The thermal stability of the compounds or of the solid solutions increases when the ionic radius of the Ln3+ decreases. The behavior of these compounds under oxidizing conditions is reported.