METHOD FOR STORING METALLIC LANTHANUM TARGET, VACUUM-SEALED METALLIC LANTHANUM TARGET, AND THIN FI

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This method for storing a metallic lanthanum sputtering target is characterized by : processing ahead of time in a manner so that the surface roughness (Ra) of a metallic lanthanum target that is to be stored becomes no greater than 1 μm; then inserting the metallic lanthanum target, to which a lanthanum fluoride coating has been formed, into a vacuum pack having an oxygen permeability of no greater than 0.1 cm3/m2·24h·atm and a water vapor permeability of no greater than 0.1 g/m2·24h; and then evacuating, sealing, and storing the vacuum pack. The present invention provides a technique that contrives a method for storing targets of metallic lanthanum, a rare earth metal, suppresses the phenomenon of turning into powder due to oxidation of the target due to residual and infiltrated air, and enables long-term storage in a usable state as a sputtering target.