METHOD AND APPARATUS FOR PRODUCING CRYSTAL GRADE ANHYDROUS RARE EARTH HALIDES

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The invention relates to a method for producing crystal grade anhydrous rare earth halides, comprising the steps of melting an oxyhalide-free anhydrous NH4X/REX3 mixed salt, wherein X = C1 or Br, and RE is selected from the group consisting of Y, La and lanthanides, passing the melt through a carbon adsorbing filter, and allowing the melt to solidify in a mold, wherein all process steps are performed under inert gas flow. The molded rare earth halides obtained are carbon free and allow easy handling.