SiO — Properties & Data | MatWorld

SiO

ceramic

· JVASP-34188· SiO

Silicon monoxide (SiO) is a non-stoichiometric ceramic compound that exists in a substoichiometric state between pure silicon and silicon dioxide, combining both metallic and ceramic characteristics. It is primarily used in thin-film applications, optical coatings, and semiconductor device processing where its unique electronic and optical properties provide advantages over fully oxidized silica. SiO is notable in vacuum deposition and microelectronics manufacturing for its ability to serve as a moisture barrier, antireflection coating, or intermediate layer, and has research interest in advanced optics and emerging semiconductor technologies where its partial oxidation state enables property tuning unavailable with conventional SiO₂.

thin-film optical coatingssemiconductor device passivationvacuum deposition processesmoisture barrier layersadvanced optics and antireflection filmsmicroelectronics manufacturing

Compliance & Regulations

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

Units:

si imperial

Property	Value	Unit	Conditions
Bulk Modulus(K)	25.31	GPa	DFT · OptB88vdW
Poisson's Ratio(ν)	0.4000	-	DFT · OptB88vdW
Shear Modulus(G)	10.67	GPa	DFT · OptB88vdW

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

Property	Value	Unit	Conditions	Source
Density(ρ)	2.592	kg/m³	DFT · OptB88vdW

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

Filter by

Method

Carrier

Property	Value	Unit	Conditions
Band Gap(Eg)2 entries	0.000	eV	DFT · OptB88vdW
↳	0.7920	eV	DFT · TBmBJ
Dielectric Constant (Relative Permittivity)(εr)	33.88	-	DFT · OptB88vdW
High-Frequency Dielectric Constant (ε∞)(ε∞)	5.086	-	DFT · TBmBJ
Magnetic Moment(μB)	0.000	µB	DFT · OptB88vdW
Piezoelectric Modulus(eij)	0.1001	C/m²	DFT · OptB88vdW
Thermoelectric Power Factor(PF)2 entries	0.000781	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.000447	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	-81.83	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	68.95	μV/K	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Spectroscopic Limited Maximum Efficiency (SLME)(SLME)	26.21	%	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.

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

Property	Value	Unit	Conditions	Source
Energy Above Hull(ΔEhull)	0.3572	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)	-1.820	eV/atom	DFT · OptB88vdW

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.

SiO

Mechanical Properties

Physical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental