24621-21-4

dark gray; fcc, a=0.4388nm; hardness, 8+ Mohs; electrical resistivity 78μοhm· cm; transition temp 15.2K; can be prepared by heating Nb metal in excess N2 or NH3 to 700°C–1100°C; used in the form of 99.5% pure sputtering target for increasing electrical stability of diodes, transistors, and integrated circuits [KIR81] [CIC73] [CER91]

Dark gray crystals. Transition temperature 15.2 K. Insoluble in HCL, HNO₃ and H₂SO₄; but attacked by hot caustic, lime, or strong alkalis evolving NH₃.

1. Taking metallic niobium and nitrogen as raw materials, the crushed metallic niobium is sent into the nitriding furnace, and then nitrogen or ammonia is introduced to make it react at 700-1100℃ to directly synthesize niobium nitride. Or in the crushed m