Niobium

Niobium, lub cim cim: Nb, atomic tooj 41, yog ib pawg VB hlau. Niobium muaj qhov ntom ntom ntawm 8.57 g / cm³, melting point ntawm 2477 degree thiab boiling point ntawm 4744 degree. Niobium yog nyiaj-grey, mos thiab ductile tsis tshua muaj siab melting point hlau. Nyob rau hauv chav tsev kub, niobium tsis hnov ​​​​mob nrog huab cua thiab tsis oxidize kiag li thaum liab kub hauv oxygen. Ntawm qhov kub thiab txias, niobium tuaj yeem ncaj qha rau kev sib txuas nrog sulfur, nitrogen thiab carbon. Niobium tsis hnov ​​​​mob nrog inorganic acids lossis hauv paus thiab yog insoluble hauv aqua regia, tab sis yog soluble hauv hydrofluoric acid. Cov ntsiab lus ntawm niobium nyob rau hauv lub ntiaj teb crust yog 20 ppm, thiab kev faib ntawm niobium cov peev txheej yog cov concentrated. Vim nws cov superconductivity zoo, siab melting point, corrosion kuj thiab hnav tsis kam, niobium yog dav siv nyob rau hauv cov hlau, superconducting cov ntaub ntawv, aerospace thiab atomic zog.