Rare earth borate and making method

摘要

A rare earth borate in the form of substantially spherical, uniform diameter particles having an average particle diameter of 0.5-2 mum is prepared by mixing substantially spherical rare earth oxide co-precipitates having an average particle diameter of 0.5-2 mum with boric acid or boron oxide, and heating the mixture at 600-1100° C. for reaction. It is a useful raw material for phosphor manufacture.