“niobium”的概念、定义、翻译、参考文献-科学参考

niobium

Science and Technology

A chemical element (Nb), atomic number 41, which was formerly called columbium in North America alone (the name was abandoned in 1949). Niobium is a soft, grey, ductile transition metal with properties very similar to those of tantalum, making the two difficult to distinguish. It becomes a superconductor at low temperatures, and has a number of industrial uses.
Mike Allaby

Chemistry

A soft ductile grey-blue metallic transition element; a.n. 41; r.a.m. 92.91; r.d. 8.57; m.p. 2468°C; b.p. 4742°C. It occurs in several minerals, including niobite (Fe(NbO₃)₂), and is extracted by several methods including reduction of the complex fluoride K₂NbF₇ using sodium. It is used in special steels and in welded joints (to increase strength). Niobium–zirconium alloys are used in superconductors. Chemically, the element combines with the halogens and oxidizes in air at 200°C. It forms a number of compounds and complexes with the metal in oxidation states 2, 3, or 5. The element was discovered by Charles Hatchett (1765–1847) in 1801. Formerly, it was called columbium.
https://www.webelements.com/niobium/ Information from the WebElements site

单词	niobium
释义	niobium Science and Technology A chemical element (Nb), atomic number 41, which was formerly called columbium in North America alone (the name was abandoned in 1949). Niobium is a soft, grey, ductile transition metal with properties very similar to those of tantalum, making the two difficult to distinguish. It becomes a superconductor at low temperatures, and has a number of industrial uses. Mike Allaby Chemistry A soft ductile grey-blue metallic transition element; a.n. 41; r.a.m. 92.91; r.d. 8.57; m.p. 2468°C; b.p. 4742°C. It occurs in several minerals, including niobite (Fe(NbO₃)₂), and is extracted by several methods including reduction of the complex fluoride K₂NbF₇ using sodium. It is used in special steels and in welded joints (to increase strength). Niobium–zirconium alloys are used in superconductors. Chemically, the element combines with the halogens and oxidizes in air at 200°C. It forms a number of compounds and complexes with the metal in oxidation states 2, 3, or 5. The element was discovered by Charles Hatchett (1765–1847) in 1801. Formerly, it was called columbium. https://www.webelements.com/niobium/ Information from the WebElements site
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