Lamo3 type composition, m being aluminium, gallium or...

C - Chemistry – Metallurgy – 01 – F

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Details

C01F 17/00 (2006.01) B01D 71/02 (2006.01) B01J 4/04 (2006.01) C01B 13/02 (2006.01) C01G 15/00 (2006.01) C04B 35/01 (2006.01) C04B 35/44 (2006.01) G01N 27/407 (2006.01) H01M 8/12 (2006.01)

Patent

CA 2273506

The invention concerns a LaMO¿3? 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.

La présente invention concerne un composé du type LaMO3, M étant l'aluminium, le gallium ou l'indium, sous forme poudre ou sous forme frittée, son procédé de préparation et son utilisation en tant que conducteur d'oxygène. Le composé sous forme poudre est susceptible d'atteindre par frittage sans pression une densité au moins égale à 93 % de la densité théorique et de donner un composé fritté substantiellement exempt de phase secondaire électriquement active aux joints de grains. Le composé sous forme poudre est obtenu par réaction des sels de lanthane et de l'élément M avec une base puis séparation et calcination du précipité obtenu. Il peut aussi être obtenu par mélange en milieu liquide de sels de lanthane et de l'élément M et, éventuellement, d'une base; puis séchage par atomisation et calcination du précipité obtenu. Le composé fritté peut être utilisé dans toute application nécessitant un matériau sous forme oxyde, conducteur d'oxygène, comme les piles à combustible à oxydes solides.

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