Name: Niobium nitride
CAS: 24621-21-4
English name: NIOBIUM NITRIDE
Chemical formula: NbN
Purity: ≥99.5%
Crystal: cubic
Color: Black
Relative density: 8.47
Molecular weight: 106.913
Melting point: 2300℃; Heat of formation -237.8 kJ /mol
Mohs hardness: 8
Microhardness: 14.3GPa
Resistivity: 200u.cm. The critical temperature of superconducting transition is 15.6K.
Water soluble: insoluble in soluble and concentrated acid solution, but also soluble in hot alkali or high concentration lye, and release ammonia gas. When heated to 500 ~ 800℃ in the air, niobium pentoxide is generated and nitrogen is released.

Synthesis process:
The crushed niobium metal is fed into a nitriding furnace with niobium metal and nitrogen as raw materials, and nitrogen or ammonia is introduced to react at 700 to 1100°C to directly synthesize niobium nitride.
Purpose:
1. Used as carbide additive, high purity niobium can also be prepared. When heated to 500 ~ 800℃ in the air, niobium pentoxide is generated and nitrogen is released. Niobium nitride decomposes in vacuum to form niobium metal. Niobium nitride and titanium carbide, zirconium carbide, vanadium carbide, rammed tantalum etc can form solid solutions.
Niobium nitride is a popular superconducting material because its "critical temperature" is relatively high in terms of its "shape", with a superconducting critical temperature of 17.3K. The upper critical magnetic field is 43T. The critical current density Jc, (4.2K, 20T) is up to 2×106A/cm2. High thermal and chemical stability, neutron irradiation resistance, is an excellent superconducting thin film material, the critical temperature is the transition point from ordinary metal to superconductor, but like most superconductors, the critical temperature is low when deposited into thin films on nanodevices. Superconducting material niobium nitride (two-dimensional crystal layer) was added to nitride semiconductor substrate, and niobium nitride NbNx film was directly grown on aluminum nitride AlN layer. At temperatures below about 16 degrees above absolute zero, niobium nitride can become a superconducting material.
3. For the production of highly stable superconducting quantum instrument devices.
Packaging and storage: This product is packed in inert plastic bags, sealed and stored in dry and cool environment, should not be exposed to air, prevent moisture oxidation and agglomeration, affect the dispersion performance and use effect; The quantity of packaging can be provided according to customer's request, sub-packaging