Cov khoom
| Niobium | |
| Phase ntawm STP | khov kho |
| Melting point | 2750 K (2477 ° C, 4491 ° F) |
| Boiling point | 5017 K (4744 ° C, 8571 ° F) |
| Ceev (ze rt) | 8,57g 3 |
| Kub ntawm fusion | 30 kJ/mol |
| Kub ntawm vaporization | 689.9 kJ/mol |
| Molar tshav kub muaj peev xwm | 24.60 J/(mol·K) |
| Qhov tshwm sim | grey metallic, xiav thaum oxidized |
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Niobium hmoov
Niobium hmoov (CAS No. 7440-03-1) yog lub teeb grey nrog lub siab melting point thiab anti-corrosion.Nws yuav siv sij hawm ib tug bluish tint thaum raug huab cua ntawm chav tsev kub rau ncua sij hawm.Niobium yog ib yam khoom uas tsis tshua muaj, mos, malleable, ductile, grey-dawb hlau.Nws muaj lub cev-centered cubic crystalline qauv thiab hauv nws lub cev thiab tshuaj lom neeg nws zoo li tantalum.Cov hlau oxidation hauv huab cua pib ntawm 200 ° C.Niobium, thaum siv alloying, txhim kho lub zog.Nws cov khoom superconductive yog txhim kho thaum ua ke nrog zirconium.Niobium micron hmoov pom nws tus kheej nyob rau hauv ntau yam kev siv xws li electronics, alloy-making, thiab kev kho mob vim nws ntshaw tshuaj, hluav taws xob, thiab txhua yam khoom.
