A method of manufacturing a rare earth containing phosphate

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A method for the synthesis of rare earth containing phosphates of the LaPO4 : Ce, Tb type comprising providing an initial charge of phosphate having a pH above 2 to a reactor; subsequently commencing introduction of a rare earth solution to the reactor, and subsequently, continuing to introduce both the phosphate and the rare earth solution to the reactor to form a mixture; whereby a rare earth phosphate precipitate is produced, at least a portion of which is precipitated while the pH of the mixture is less than 2.