Rhodia Operations

Yvan Montardi

Thierry Le-Mercier

Laurent Thiers

Valérie Buissette

Olivier Le-Roux

Liquid phase suspensions of substantially monocrystalline rare-earth borate particles, the mean size thereof ranging from 100 to 400 nm, are prepared by roasting a rare earth borocarbonate or hydroxyborocarbonate at a temperature which is sufficient for forming a borate and obtaining a product whose specific surface area is equal to or greater than 3 m/g and then wet grinding the roasted product; such borates are useful in the form of luminophors, in particular, as luminescent transparent materials.

Submicron rare-earth borates and preparation/luminoshors thereof

Submicronic barium and magnesium aluminates, useful as phosphors, are in the form of a liquid-phase suspension of substantially monocrystalline particles having an average particle size ranging from 80 to 400 nm; such aluminates are prepared by a process that includes: providing a liquid mixture containing compounds of aluminum and of other elements that are part of the aluminate composition; drying the mixture by atomization; calcining the dried product in a reducing atmosphere and wet-grinding this product.

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Cormeilles-en-Parisis, France

Yvan Montardi