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- W157458568 abstract "Scandium metal was prepared by reducing ScF/sub 3/ or anhydrous ScCl/sub 3/ with calcium metal in an argon or helium atmosphere at 850 to 900 deg C. The metallic scandium contained 2.5% Sc/sub 2/O/sub 3/ as the principal impurity. The metal was further purified by distilling from a tantalum crucible in a high vacuum (10/sup -5/ to 10/sup -6/ mm Hg std) at 1500 to 1650 deg C. The resulting product of metallic scandium contained 99.5 wt% Sc and <0.1% oxygen. Experiments with the metal showed an increase of 0.4% for a 20 hour exposure of the metal to dry oxygen at 200 deg C. The increase in weight was 1.0% in moist oxygen at 200 deg C, 2.0% in dry oxygen at 250 deg C, and 2.5% in moist oxygen at 250 deg C. Sc metal started to react with N/sub 2/ at 600 deg C, and the reaction proceeded at a significant rate at 800 deg C. The formation of ScN was 65% complete at 800 deg C after 20 hours. Sc metal dissolved 50 times faster in weak HCl or H/sub 2/SO/ sub 4/ than in HNO/sub 3/ solutions. Sc metal scarcely reacted with 10% NaOH, butmore » did dissolve slowly in 20, 30, and 40% NaOH at 25 deg C. The chemical properties of Sc metal depended very little on its purity. (TTT)« less" @default.
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- W157458568 date "1962-05-01" @default.
- W157458568 modified "2023-09-23" @default.
- W157458568 title "AN INVESTIGATION OF HIGH-PURITY METALLIC SCANDIUM" @default.
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