C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 11/81 (2006.01) C01B 25/45 (2006.01)
Patent
CA 2741977
The invention relates to a rare earth (Ln) phosphate, Ln being either at least one rare earth selected from cerium and terbium, or lanthanum in combination with at least one of the two above-mentioned rare earths, that has a crystalline structure of the rhabdophane type or of the mixed rhabdophane/monazite type with a potassium content of 7000 ppm at most. The phosphate is obtained by the precipitation of a rare earth chloride at a constant pH lower than 2, by calcination at a temperature lower than 500°C and by redispersion in hot water. The invention also relates to a phosphor obtained by the calcination at at least 1000°C of said phosphate.
Le phosphate de terre rare (Ln) de l'invention, Ln représentant soit au moins une terre rare choisie parmi le cérium et le terbium, soit le lanthane en combinaison avec au moins l'une des deux terres rares précitées, présente une structure cristalline de type rhabdophane ou de type mixte rhabdophane/monazite avec une teneur en potassium d'au plus 7000 ppm. Le phosphate est obtenu par précipitation d'un chlorure de terre rare à pH maintenu constant inférieur à 2 puis calcination à une température inférieure à 500°C et redispersion dans l'eau chaude. L'invention concerne aussi un luminophore obtenu par calcination à au moins 1000°C du phosphate.
Aurissergues Franck
Bernard Joel
Buissette Valerie
Le-Mercier Thierry
Rhodia Operations
Robic
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