Silicon nitride

Silicon nitride is a chemical compound of the elements silicon and nitrogen. Si
3N
4 (Trisilicon tetranitride) is the most thermodynamically stable and commercially important of the silicon nitrides, and the term ″Silicon nitride″ commonly refers to this specific composition. It is a white, high-melting-point solid that is relatively chemically inert, being attacked by dilute HF and hot H
3PO
4. It is very hard (8.5 on the mohs scale). It has a high thermal stability with strong optical nonlinearities for all-optical applications.

Silicon nitride

Sintered silicon nitride ceramic
Names
Preferred IUPAC name
Silicon nitride
Other names
Trisilicon tetranitride,
Nierite
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.620
EC Number
  • 234-796-8
MeSH Silicon+nitride
UNII
  • InChI=1S/N4Si3/c1-5-2-6(1)3(5)7(1,2)4(5)6 Y
    Key: HQVNEWCFYHHQES-UHFFFAOYSA-N Y
  • InChI=1S/N4Si3/c1-5-2-6(1)3(5)7(1,2)4(5)6
    Key: HQVNEWCFYHHQES-UHFFFAOYSA-N
  • InChI=1/N4Si3/c1-5-2-6(1)3(5)7(1,2)4(5)6
    Key: HQVNEWCFYHHQES-UHFFFAOYAJ
  • N13[Si]25N4[Si]16N2[Si]34N56
Properties
Si3N4
Molar mass 140.283 g·mol−1
Appearance grey, odorless powder
Density 3.17 g/cm3
Melting point 1,900 °C (3,450 °F; 2,170 K) (decomposes)
Insoluble
2.016
Thermochemistry
101.3 J·mol−1·K−1
−743.5 kJ·mol−1
−642.6 kJ·mol−1
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
Related compounds
Other anions
 silicon carbide, silicon dioxide
Other cations
 boron nitride, carbon nitride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
Infobox references
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