Name | niobium disilicide |
Synonyms | NIOBIUM SILICIDE Niobium silicide NIOBIUM DISILICIDE COLUMBIUM SILICIDE niobium disilicide Niobium disilicide niobiumsilicide(nbsi2) Niobium silicide (NbSi2) NIOBIUM SILICIDE -325 MESH bis(λ2-silanylidene)niobium |
CAS | 12034-80-9 |
EINECS | 234-812-3 |
InChI | InChI=1/Nb.2Si/rNbSi2/c2-1-3 |
Molecular Formula | NbSi2 |
Molar Mass | 149.08 |
Density | 5.7 |
Melting Point | 1940 °C |
Water Solubility | Insoluble in water. |
Appearance | Powder |
Storage Condition | Room Temprature |
Safety Description | S22 - Do not breathe dust. S24/25 - Avoid contact with skin and eyes. |
WGK Germany | 3 |
TSCA | Yes |
is gray hexagonal crystal. The relative density is 5.7. The lattice constant is 0. 4863nm,C = 0. 6604nm. Melting point 1950 ℃, micro-Hardness 10. 3GPa(1050kg/mm2), Vickers hardness 5. 88~6.88GPA (600 ~ 700kg/mm2), conductivity 50.4 × 10-4 S/m, thermal expansion coefficient 7.3 × 10-6. C 1. Insoluble in water, concentrated hydrochloric acid, concentrated sulfuric acid, soluble in hydrofluoric acid and sulfuric acid mixed solution.
with metal niobium and silicon as raw materials, the metal niobium and metal silicon are crushed, mixed well, put into a graphite furnace, gradually heated and raised, and when the temperature reaches 1000 ℃, then, hydrogen gas was introduced to raise the temperature to 1400-1900 ° C. And the reaction was continued to obtain niobium silicide. Niobium pentoxide and silicon metal may also be placed in a reduction furnace and reduced at 1400 ° C. For more than 30min to produce niobium silicide.
It can be made into a solid solution with zirconium dioxide, molybdenum dioxide and tungsten trisilate, and used as a fine ceramic raw material.
crystal structure | Hexagonal |
EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |