PROCESS FOR THE PREPARATION OF A RARE EARTH BORATE BY REACTION OF AT LEAST ONE RARE EARTH SALT, BORIC ACID AND A BASE

摘要

The invention concerns a method for preparing a rare earth borate by reacting at least one rare earth salt, boric acid and a base. This method is characterised in that a reaction is carried out using excess acid with respect to stoichiometry and in conditions such that the pH of the reaction medium at the end of the reaction is between 6 and 8, the resulting precipitate is recuperated and calcined. The borate obtained has a good phasic purity and can be used as luminophore.