![]() Sintered silicon nitride ceramic
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Names | |
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Preferred IUPAC name
Silicon nitride | |
Other names
Trisilicon tetranitride,[1]
Nierite | |
Identifiers | |
3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.031.620 |
EC Number |
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MeSH | Silicon+nitride |
PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
Si3N4 | |
Molar mass | 140.283 g·mol−1 |
Appearance | grey, odorless powder[2] |
Density | 3.17 g/cm3[2] |
Melting point | 1,900 °C (3,450 °F; 2,170 K)[2] (decomposes) |
Insoluble[2] | |
Refractive index (nD)
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2.016[3] |
Thermochemistry[4] | |
Std molar
entropy (S⦵298) |
101.3 J·mol−1·K−1 |
Std enthalpy of
formation (ΔfH⦵298) |
−743.5 kJ·mol−1 |
Gibbs free energy (ΔfG⦵)
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−642.6 kJ·mol−1 |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards
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[5] |
Related compounds | |
Other anions
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silicon carbide, silicon dioxide |
Other cations
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boron nitride, carbon nitride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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,[6] 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.[7]
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