METHOD TO REDUCE BORON CONTENT OF OXIDE OF RARE EARTH ELEMENT INCLUDING BORON

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PROBLEM TO BE SOLVED : To provide a method to simply reduce a boron content of oxides of rare earth elements including boron. SOLUTION : Oxides of rare earth elements including boron are subjected to heat treatment with alkali metal carbonates and/or oxides. The heat treatment is preferably performed at 1150°C or more. COPYRIGHT : (C)2014, JPO&INPIT