| 单词 | zirconium |
| 释义 | zirconium in British English (zɜːˈkəʊnɪəm) noun a greyish-white metallic element, occurring chiefly in zircon, that is exceptionally corrosion-resistant and has low neutron absorption. It is used as a coating in nuclear and chemical plants, as a deoxidizer in steel, and alloyed with niobium in superconductive magnets. Symbol: Zr; atomic no: 40; atomic wt: 91.224; valency: 2, 3, or 4; relative density: 6.506; melting pt: 1855±2°C; boiling pt: 4409°C Derived forms zirconic (zɜːˈkɒnɪk) adjective Word origin C19: from New Latin; see zirconzirconium in American English (zərˈkoʊniəm) noun a hard, ductile, gray or black, metallic chemical element found combined in zircon, etc., and used in alloys, ceramics, the cladding for nuclear fuel in reactors, etc.: symbol, Zr; at. no., 40 Derived forms zirconic (zirˈconic) (zərˈkɑnɪk) adjective Word origin ModL < zirconia + -ium: name proposed (1808) by Davy for element later isolated (1824) by BerzeliusExamples of 'zirconium' in a sentence |
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