24621-21-4
Niobium nitride
CAS: 24621-21-4
Molecular Formula: NNb
24621-21-4 - Names and Identifiers
| Name | Niobium nitride |
| Synonyms | nitridoniobium NIOBIUM NITRIDE Niobium nitride Einecs 246-362-5 COLUMBIUM NITRIDE azanylidyneniobium Niobium nitride (NbN) NIOBIUM NITRIDE -325 MESH Niobiumnitride(metalsbasis) Niobiumnitridemetalsbasisgraypowder |
| CAS | 24621-21-4 |
| EINECS | 246-362-5 |
| InChI | InChI=1/N.Nb/rNNb/c1-2 |
24621-21-4 - Physico-chemical Properties
| Molecular Formula | NNb |
| Molar Mass | 106.91 |
| Density | 8,4 g/cm3 |
| Melting Point | 2573°C |
| Water Solubility | Insoluble in water. |
| Appearance | Powder |
| Specific Gravity | 8.4 |
| Physical and Chemical Properties | Niobium nitride, light gray, slightly yellow. Relative density 8. 47I melting point 2300 ℃; Heat of formation -237. 8kj/mol; Mohs hardness 8, microhardness 14. 3GPa; Resistivity 200u.cm. The critical temperature of superconducting transition is 15. 6K. Insoluble in hydrochloric acid, nitric acid, sulfuric acid; Soluble in hydrofluoric acid and sulfuric acid concentrated acid solution, also soluble in hot alkali or high concentration of alkali, and release ammonia. When heated to 500 to 800 ° C. In air, niobium pentoxide is formed and nitrogen is released. The niobium nitride decomposes in vacuum to form niobium metal. Niobium nitride and titanium carbide, zirconium carbide, Vanadium carbide, tantalum halide, and the like may form a solid solution. niobium nitride is a popular superconducting material because its "critical temperature" is relatively high in terms of its "shape. The critical temperature is the transition point from a common metal to a superconductor. But like most superconductors, the critical temperature is lower when it is deposited as a thin film on a nano-device. |
24621-21-4 - Risk and Safety
| TSCA | Yes |
24621-21-4 - Nature
Open Data Verified Data
Light gray, slightly yellow. Relative density 8. 47I melting point 2300 ℃; Heat of formation -237. 8kj/mol; Mohs hardness 8, microhardness 14. 3GPa; Resistivity 200u.cm. The critical temperature of superconducting transition is 15. 6K. Insoluble in hydrochloric acid, nitric acid, sulfuric acid; Soluble in hydrofluoric acid and sulfuric acid concentrated acid solution, also soluble in hot alkali or high concentration of alkali, and release ammonia. When heated to 500 to 800 ° C. In air, niobium pentoxide is formed and nitrogen is released. The niobium nitride decomposes in vacuum to form niobium metal. Niobium nitride and titanium carbide, zirconium carbide, Vanadium carbide, tantalum halide, and the like may form a solid solution.
Last Update：2024-01-02 23:10:35
24621-21-4 - Preparation Method
Open Data Verified Data
crushed niobium metal was fed into a nitride furnace using niobium metal and nitrogen gas as raw materials, and nitrogen gas or ammonia gas was introduced to react at 700 to 1100 ° C. To directly synthesize niobium nitride. Alternatively, carbon powder is added to the pulverized metal niobium powder, mixed well, and then sent to a reduction furnace. Then, hydrogen gas and nitrogen gas are introduced, and a reduction reaction is carried out at a temperature of 1250 ° C. For 2H to obtain niobium chloride.
Last Update：2022-01-01 09:05:32
24621-21-4 - Use
Open Data Verified Data
as a cemented carbide additive, high purity niobium can also be prepared.
Last Update：2022-01-01 09:05:33
24621-21-4 - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| Uses | Niobium nitride is used as a cemented carbide additive, and high-purity niobium can also be prepared. |
| synthesis method | 1. using niobium metal and nitrogen as raw materials, the crushed niobium metal is sent into a nitride furnace, and nitrogen or ammonia is introduced to directly synthesize niobium nitride at 700~1100 ℃. Or add carbon powder to the crushed metal niobium powder, make it fully mixed and send it to the reduction furnace, then pass hydrogen and nitrogen, and reduce the reaction at 1250 ℃ for 2h to obtain niobium chloride. 2. niobium nitride is prepared from niobium metal and nitrogen by direct method. the reaction formula is as follows: NB2O5 2N 5C = = 2NbN 5CO. The crushed metal niobium is sent into the nitride furnace, and nitrogen or ammonia is introduced to make it react at 700~1100 ℃ for 1~2h to obtain niobium nitride. 3. The reduction method uses niobium pentoxide and nitrogen as raw materials to prepare niobium nitride in the presence of carbon. The reaction formula is as follows: Nb N = = NbN. add carbon powder to the crushed metal niobium powder, make it fully mixed and send it to the reduction furnace, then pass hydrogen and nitrogen, and reduce at 1250 ℃ for 2h to obtain niobium nitride. |
Last Update：2024-04-09 21:04:16
