Si3N4 — Properties & Data | MatWorld

Si3N4

ceramic

· Si3N4

Silicon nitride (Si₃N₄) is a high-performance structural ceramic composed of silicon and nitrogen, valued for its exceptional hardness, thermal stability, and resistance to thermal shock. It is widely used in automotive engines (turbocharger rotors, glow plugs), aerospace applications, cutting tools, and bearing components where superior wear resistance and high-temperature capability are required. Engineers select Si₃N₄ over traditional metals and alumina ceramics when demanding applications require a material that maintains strength at elevated temperatures while remaining lightweight, with particular advantage in environments involving thermal cycling or abrasive wear.

turbocharger rotorsceramic cutting toolsbearing componentsengine combustion chambersthermal shock resistance applicationsaerospace valve seats

Compliance & Regulations

?Conflict Free?RoHS?REACH?TSCA?Prop 65

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Method

Property	Value	Unit	Conditions	Source
Bulk Modulus(K)3 entries	234.4	GPa	DFT
↳	165.7	GPa	DFT · OptB88vdW
↳	234.4	GPa	DFT · PBE
Elastic Compliance Tensor(Sij)	Matrix (redacted)	1/GPa	DFT · PBE
Elastic Anisotropy(AU)	0.3757	-	DFT · PBE
Elastic Stiffness Tensor(Cij)	Matrix (redacted)	Pa	DFT · PBE
Poisson's Ratio(ν)2 entries	-0.5800	-	DFT · OptB88vdW
↳	0.2806	-	DFT · PBE
Shear Modulus(G)3 entries	120.5	GPa	DFT
↳	50.07	GPa	DFT · OptB88vdW
↳	120.5	GPa	DFT · PBE

N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form, heat treatment, basis, or test environment.

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Property	Value	Unit	Conditions	Source
Thermal Conductivity(k)	30.00	W/(m·K)	Measured

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Property	Value	Unit	Conditions	Source
Density(ρ)	3.090	kg/m³	DFT · OptB88vdW

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Method

Carrier

Property	Value	Unit	Conditions	Source
Band Gap(Eg)3 entries	5.100	eV	Measured
↳	4.461	eV	DFT · OptB88vdW
↳	5.620	eV	DFT · TBmBJ
Dielectric Constant (Relative Permittivity)(εr)2 entries	8.191	-	DFT · OptB88vdW
↳	8.160	-	DFT · PBE
High-Frequency Dielectric Constant (ε∞)(ε∞)2 entries	4.239	-	DFT · OptB88vdW
↳	3.624	-	DFT · TBmBJ
Electronic Dielectric Tensor(ε∞)	Matrix (redacted)	-	DFT · PBE
Total Dielectric Tensor(ε)	Matrix (redacted)	-	DFT · PBE
Electron Effective Mass(m*e)	1.013	me	DFT · OptB88vdW · 27°C
Hole Effective Mass(m*h)	1.340	me	DFT · OptB88vdW · 27°C
Magnetic Moment(μB)	0.000	µB	DFT · OptB88vdW
Piezoelectric Modulus(eij)	0.1411	C/m²	DFT · OptB88vdW
Thermoelectric Power Factor(PF)2 entries	0.00138	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.00158	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	-170.7	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	289.6	μV/K	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Spectroscopic Limited Maximum Efficiency (SLME)(SLME)	0.000	%	DFT · TBmBJ

N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form, heat treatment, basis, or test environment.

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Method

Property	Value	Unit	Conditions	Source
Energy Above Hull(ΔEhull)	0.7422	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)2 entries	-0.4503	eV/atom	DFT · OptB88vdW
↳	-1.103	eV/atom	Measured

N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form, heat treatment, basis, or test environment.

Verified Unverified Low confidence (<80%) Link to source

Reference data from cited sources. Not verified or certified by MatWorld Inc. Verify against the source before use in design. Terms: engineering data

Regulatory Screening

Environmental

RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.