Submicron rare-earth borates and preparation/luminoshors thereof

US8980130B2 · kind B2 · utility

Assignee

• RHODIA OPERATIONS · FR

Inventors

• Valérie Buissette · Paris, FR
• Thierry Le-Mercier · Rosny-sous-Bois, FR
• Yvan Montardi · Cormeilles-en-Parisis, FR
• Laurent Thiers · Savigny-sur-Orge, FR

Key dates

• Filing date: Oct 9, 2006
• Grant date: Mar 17, 2015
• Expiry date: Mar 11, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2982
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

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 m2/g and then wet grinding the roasted product; such borates are useful in the form of luminophors, in particular, as luminescent transparent materials.