LaMO3 TYPE COMPOSITION, M BEING ALUMINIUM, GALLIUM OR INDIUM, IN POWDER OR SINTERED FORM, METHOD OF PREPARATION AND USE AS CONDUCTOR OF OXYGEN

摘要

The invention concerns a LaMO3 type composition, M being aluminium, gallium or indium, in powder or sintered form, its method of preparation and its use as conductor of oxygen. The compound in powder form is capable of reaching by loose powder sintering a density at least equal to 93 % of its theoretical density and of resulting in a sintered compound substantially free from an electrically active secondary phase at the grain boundary. The compound in powder form is obtained by reacting salts of lanthanum and of element M with a base then separating and calcining the resulting precipitate. It can also be obtained by mixing in a liquid medium salts of lanthanum and of element M and, optionally, of a base; then drying by pulverisation and calcination of the resulting precipitate. The sintered compound can be used in any application requiring a material in oxide form, oxygen conductive, such as fuel cells with solid oxides.