Silicon nitride

Silicon nitride
	; Sintered silicon nitride ceramic
Names
	Preferred IUPAC name Silicon nitride
	Other names Trisilicon tetranitride,; Nierite
Identifiers
CAS Number	12033-89-5 ;
3D model (JSmol)	Interactive image;
ChemSpider	2341213 ;
ECHA InfoCard	100.031.620
EC Number	234-796-8;
MeSH	Silicon+nitride
PubChem CID	3084099;
UNII	QHB8T06IDK ;
CompTox Dashboard (EPA)	DTXSID20892247 ;
	InChI InChI=1S/N4Si3/c1-5-2-6(1)3(5)7(1,2)4(5)6 Key: HQVNEWCFYHHQES-UHFFFAOYSA-N ; 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;
	SMILES N13[Si]25N4[Si]16N2[Si]34N56;
Properties
Chemical formula	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)
Solubility in water	Insoluble
Refractive index (nD)	2.016
Thermochemistry
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⦵)	−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). verify (what is ?) Infobox references

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]

^ "Silicon nitride (compound)". PubChem. Retrieved 2023-06-04.
^ ^a ^b ^c ^d Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.88. ISBN 1-4398-5511-0.
^ Refractive index database. refractiveindex.info
^ CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data. William M. Haynes, David R. Lide, Thomas J. Bruno (2016-2017, 97th ed.). Boca Raton, Florida. 2016. ISBN 978-1-4987-5428-6. OCLC 930681942.{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: others (link)
^ ITEM # SI-501, SILICON NITRIDE POWDER MSDS Archived 2014-06-06 at the Wayback Machine. metal-powders-compounds.micronmetals.com
^ Mellor, Joseph William (1947). A Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 8. Longmans, Green and Co. pp. 115–7. OCLC 493750289.
^ López-Suárez, A.; Torres-Torres, C.; Rangel-Rojo, R.; Reyes-Esqueda, J. A.; Santana, G.; Alonso, J. C.; Ortiz, A.; Oliver, A. (2009-06-08). "Modification of the nonlinear optical absorption and optical Kerr response exhibited by nc-Si embedded in a silicon-nitride film". Optics Express. 17 (12): 10056–10068. Bibcode:2009OExpr..1710056L. doi:10.1364/OE.17.010056. ISSN 1094-4087. PMID 19506657.

[1] "Silicon nitride (compound)". PubChem. Retrieved 2023-06-04.

[b92-2] Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.88. ISBN 1-4398-5511-0.

[3] Refractive index database. refractiveindex.info

[CRC97-4] CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data. William M. Haynes, David R. Lide, Thomas J. Bruno (2016-2017, 97th ed.). Boca Raton, Florida. 2016. ISBN 978-1-4987-5428-6. OCLC 930681942.{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: others (link)

[safetydatasheet-5] ITEM # SI-501, SILICON NITRIDE POWDER MSDS Archived 2014-06-06 at the Wayback Machine. metal-powders-compounds.micronmetals.com

[6] Mellor, Joseph William (1947). A Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 8. Longmans, Green and Co. pp. 115–7. OCLC 493750289.

[7] López-Suárez, A.; Torres-Torres, C.; Rangel-Rojo, R.; Reyes-Esqueda, J. A.; Santana, G.; Alonso, J. C.; Ortiz, A.; Oliver, A. (2009-06-08). "Modification of the nonlinear optical absorption and optical Kerr response exhibited by nc-Si embedded in a silicon-nitride film". Optics Express. 17 (12): 10056–10068. Bibcode:2009OExpr..1710056L. doi:10.1364/OE.17.010056. ISSN 1094-4087. PMID 19506657.

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Names
Sintered silicon nitride ceramic
Preferred IUPAC name Silicon nitride
Other names Trisilicon tetranitride,^[1] Nierite
Identifiers
CAS Number	12033-89-5^Y
3D model (JSmol)	Interactive image
ChemSpider	2341213^Y
ECHA InfoCard	100.031.620
EC Number	234-796-8
MeSH	Silicon+nitride
PubChem CID	3084099
UNII	QHB8T06IDK^Y
CompTox Dashboard (EPA)	DTXSID20892247
InChI 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
SMILES N13[Si]25N4[Si]16N2[Si]34N56
Properties
Chemical formula	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)
Solubility in water	Insoluble^[2]
Refractive index (n_D)	2.016^[3]
Thermochemistry^[4]
Std molar entropy (S^⦵₂₉₈)	101.3 J·mol⁻¹·K⁻¹
Std enthalpy of formation (Δ_fH^⦵₂₉₈)	−743.5 kJ·mol⁻¹
Gibbs free energy (Δ_fG^⦵)	−642.6 kJ·mol⁻¹
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	^[5]
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