C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 11/77 (2006.01)
Patent
CA 2716595
The barium and magnesium aluminate of the present invention is characterised in that the same is in the form of a liquid-phase suspension of substantially monocrystalline particles having an average size of between 80 and 400 nm. The aluminate is prepared by a method that comprises: forming a liquid mixture containing compounds of aluminium and of other elements that are part of the aluminate composition; drying the mixture by atomisation; calcining the dried product in a reducing atmosphere and wet-grinding said product. The aluminate of the invention can be used as a phosphor.
L'aluminate de baryum et de magnésium de l'invention est caractérisé en ce qu'il se présente sous forme d'une suspension dans une phase liquide de particules substantiellement monocristallines de taille moyenne comprise entre 80 et 400 nm. Il est préparé par un procédé dans lequel on forme un mélange liquide comportant des composés de l'aluminium et des autres éléments rentrant dans la composition de l'aluminate; on sèche par atomisation ce mélange; on calcine le produit séché sous atmosphère réductrice et on effectue un broyage humide de ce produit. L'aluminate de l'invention peut être utilisé comme luminophore.
Buissette Valerie
Le-Mercier Thierry
Le-Roux Olivier
Montardi Yvan
Thiers Laurent
Rhodia Operations
Robic
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