| 单词 | niobium |
| 释义 | niobium /nuy oh"bee euhm/, n. Chem. a steel-gray metallic element resembling tantalum in its chemical properties; becomes a superconductor below 9 K; used chiefly in alloy steels. Symbol: Nb; at. no.: 41; at. wt.: 92.906; sp. gr.: 8.4 at 20°C. [1835-45; < NL; see NIOBE, -IUM] |
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