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Abstract
Deep purification, especially the removal of trace elements from the rare earth metal gadolinium (Gd) is challenging, due to their strong affinity and high chemical reactivity. Herein we present an effective approach to explore the purification mechanism via a novel Gas-solid two-phase method under high vacuum. All impurity elements were analyzed by glow discharge mass spectrometry (GDMS) and inert gas analysis (IGA). Both metallic impurities and oxygen can be reduced effectively after the purification process, especially the oxygen (O) concentration is close to zero. The chemical driving force, migration paths, migration laws and mechanisms of various impurity elements were studied in detail. Interactions of impurity elements during ultra-high purification process had been explored by using the specific technology of secondary ion mass spectroscopy (SIMS).
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