Molybdenum silicide
 |
|
| Names | |
|---|---|
|
IUPAC name
Molybdenum disilicide
|
|
| Identifiers | |
| ECHA InfoCard | 100.032.016 |
|
PubChem CID
|
|
| Properties | |
| MoSi2 | |
| Molar mass | 152.11 g/mol |
| Appearance | gray metallic solid |
| Density | 6.26 g/cm3 |
| Melting point | 2,030 °C (3,690 °F; 2,300 K) |
| Structure | |
| Tetragonal | |
| I4/mmm (No. 139), tI6 | |
|
a = 0.32112 nm, c = 0.7845 nm
|
|
| Hazards | |
| Flash point | Non-flammable |
|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|
|
 (what is   ?) |
|
| Infobox references | |
Molybdenum disilicide (MoSi2, or molybdenum silicide), an intermetallic compound, a silicide of molybdenum, is a refractory ceramic with primary use in heating elements. It has moderate density, melting point 2030 °C, and is electrically conductive. At high temperatures it forms a passivation layer of silicon dioxide, protecting it from further oxidation. It is a gray metallic-looking material with tetragonal crystal structure (alpha-modification); its beta-modification is hexagonal and unstable. It is insoluble in most acids but soluble in nitric acid and hydrofluoric acid.
While MoSi2 has excellent resistance to oxidation and high Young's modulus at temperatures above 1000 °C, it is brittle in lower temperatures. Also, at above 1200 °C it loses creep resistance. These properties limits its use as a structural material, but may be offset by using it together with another material as a composite material.
Molybdenum disilicide and MoSi2-based materials are usually made by sintering. Plasma spraying can be used for producing its dense monolithic and composite forms; material produced this way may contain a proportion of β-MoSi2 due to its rapid cooling.
...
Wikipedia