Compounds derived from la2mo2o9 and their use as ionic...

C - Chemistry – Metallurgy – 01 – G

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C01G 1/02 (2006.01) B01D 53/22 (2006.01) B01D 71/02 (2006.01) C01B 13/02 (2006.01) C01G 39/00 (2006.01) C01G 39/02 (2006.01) C01G 41/00 (2006.01) H01M 8/12 (2006.01)

Patent

CA 2404777

The invention concerns novel compounds derived from La2Mo2O9 and their use as ionic conductors. Said compounds correspond to the formula A2-xA'xB2-yB'yO9-z+ delta Xz wherein: A is at least a trivalent element selected among rare earths, trivalent bismuth, trivalent antimony and trivalent arsenic; A' is at least a monovalent element selected among the alkalis; or a divalent element selected among alkaline-earths, tin, lead, samarium, europium, erbium, thulium or ytterbium; or a quadrivalent element selected among thorium, uranium, the elements of group IVA, cerium, praseodymium, terbium; B is at least a hexavalent element of groups VIA, VIIA, VIII and of group VIB except oxygen; B' is at least an element selected among lithium, sodium, magnesium, calcium, scandium, yttrium, rare earths of atomic number 63 to 71, elements of groups IVA to IIB in oxidation state less than 6, aluminium III, silicon IV, gallium III, germanium IV, indium III, tin IV, phosphorus V, antimony V and bismuth V; X is selected among sulphur, fluorine or chlorine; with 0 </= x < 2; 0 </= y < 2; 0 </= z </= 3 and provided that when A is lanthanum and B tungsten or molybdenum, at least one of x, y and z is other than 0; the compounds having a cubic or pseudo-cubic cation system of the type <i> beta </i>-SnWO4.

L'invention concerne de nouveaux composés dérivés de La2Mo2O 9 et leur utilisation comme conducteurs ioniques. Ces composés de l'invention répondent à la formule A2-x A'x B2-y B'y O9- z+.delta.X z dans laquelle A est au moins un élément trivalent choisi parmi les terres rares trivalentes, bismuth trivalent, l'antimoine trivalent et l'arsenic trivalent; A' est au moins un élément monovalent choisi parmi les alcalins; ou divalent choisi parmi les alcalino-terreux, l'étain, le plomb, le samarium, l'europium, l'erbium, le thulium ou l'ytterbium; ou quadrivalent choisi parmi le thorium, l'uranium, les eléments du groupe IVA, le cérium, le praséodyme, le terbium; B est au moins un élément hexavalent les groupes VIA, VIIA, VIII et du groupe VIB excepté l'oxygène; B' est au moins un élément choisi parmi le lithium, le sodium, le magnésium, le calcium, le scandium, l'yttrium, les terres rares de numéro atomique 63 à 71, les éléments des groupes IVA à IIB dans un état d'oxydaton inférieur à 6, l'aluminium III, le silicium IV, le gallium III, le germanium IV, l'indium III, l'étain IV, le phosphore V, l'antimoine V et le bismuth V; X est choisi parmi le soufre, le fluor ou le chlore; avec 0 <= x < 2; 0 <= y < 2; 0 <= z <= 3 et avec comme condition que lorsque A est le lanthane et B le tungstène ou le molybdène, au moins un de x, de y et z est différent de 0; les composés présentant un réseau cationique de type .beta.-SnWO4 cubique ou pseudo-cubique.

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