Niobium Crucible

1.Niobium is stable in air at room temperature and is not completely oxidized when red hot in oxygen,
2.Direct combination with sulfur, nitrogen and carbon at high temperature can form alloys with titanium, zirconium, hafnium and tungsten.
3.Does not interact with inorganic acids or bases, nor is it soluble in aqua regia, but soluble in hydrofluoric acid.
4.Niobium is also resistant to various types of erosion and can form a dielectric oxide layer.