Method for reducing oxygen component and carbon component in fluoride

摘要

To provide a method for reducing oxygen and carbon components in high-purity fluoride such as calcium fluoride and barium fluoride (high-purity fluoride is not limited to calcium fluoride and barium fluoride), or in rare-earth fluoride such as ytterbium fluoride and cerium fluoride used for an optical fiber, a coating material, and so on. It is characterized in that the oxygen and carbon components contained in the high-purity fluoride are reduced by a fluorine gas treatment.