WO3
semiconductor· WO3
Tungsten trioxide (WO3) is a transition metal oxide semiconductor with a monoclinic crystal structure, commonly used in optoelectronic and electrochromic devices. It is widely employed in smart windows, gas sensors (particularly for NOx and volatile organic compounds), and photocatalytic applications for environmental remediation and water splitting. Engineers select WO3 for its tunable bandgap, strong absorption in the visible-near-infrared spectrum, and ability to reversibly change color and conductivity under applied voltage or light exposure—making it valuable for applications requiring dynamic optical or electrical response with relatively low processing temperatures.
electrochromic smart windowsgas sensorsphotocatalytic water treatmentphotoelectrochemical hydrogen generationoptical coatings and filterssolid-state battery materials
Compliance & Regulations
?EAR?Conflict Free?RoHS?REACH?TSCA?Prop 65
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Bulk Modulus(K)3 entries | 32,407.1 | ksi | — | ||
| ↳ | 24,632.5 | ksi | — | ||
| ↳ | 26,196.7 | ksi | — | ||
Elastic Compliance Tensor(Sij) | Matrix (redacted) | 1/GPa | — | ||
Elastic Anisotropy(AU) | 2.848 | - | — | ||
Elastic Stiffness Tensor(Cij) | Matrix (redacted) | ksi | — | ||
Poisson's Ratio(ν)2 entries | 0.2647 | - | — | ||
| ↳ | 0.2700 | - | — | ||
Shear Modulus(G)3 entries | 18,087.8 | ksi | — | ||
| ↳ | 15,989.5 | ksi | — | ||
| ↳ | 15,877.3 | ksi | — |
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.
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 0.2435 | lb/in³ | — |
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Band Gap(Eg)2 entries | 2.900 | eV | — | ||
| ↳ | 0.1770 | eV | — | ||
Dielectric Constant (Relative Permittivity)(εr) | 14.57 | - | — | ||
Electrical Conductivity(σ) | 0.00123 | S/cm | 127°C | ||
Electrical Resistivity(ρe) | 8.098 | Ω·m | 127°C | ||
Magnetic Moment(μB) | 0.1190 | µB | — | ||
Piezoelectric Modulus(eij) | 0.000 | C/m² | — | ||
Thermoelectric Power Factor(PF) | 1.429e-9 | W/(m·K²) | 127°C | ||
Seebeck Coefficient(S)2 entries | 107.6 | μV/K | 127°C | ||
| ↳ | 313.9 | µV/K | — |
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.
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Energy Above Hull(ΔEhull) | 0.09930 | eV/atom | — | ||
Formation Energy(ΔHf)2 entries | -2.183 | eV/atom | — | ||
| ↳ | -2.281 | eV/atom | — |
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.
Verified Unverified Low confidence (<80%) Link to source
Regulatory Screening
Environmental
Export Control
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.