| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024zir•co•ni•um (zûr kō′nē əm),USA pronunciation n. [Chem.]- Chemistrya metallic element found combined in zircon, baddeleyite, etc., resembling titanium chemically: used in steel metallurgy, as a scavenger, as a refractory, and as an opacifier in vitreous enamels. Symbol: Zr; at. wt.: 91.22;
at. no.: 40;
sp. gr.: 6.49 at 20°C.
- Neo-Latin; see zircon, -ium
- 1800–10
Collins Concise English Dictionary © HarperCollins Publishers:: zirconium /zɜːˈkəʊnɪəm/ n - 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
Etymology: 19th Century: from New Latin; see zirconzirconic /zɜːˈkɒnɪk/ adj |