WS2

metal
· WS2

Tungsten disulfide (WS₂) is a layered transition metal dichalcogenide semiconductor with a graphite-like crystalline structure, consisting of tungsten atoms sandwiched between layers of sulfur atoms. It is primarily employed as a solid lubricant, dry film coating, and emerging two-dimensional material in nanoelectronics and photonics applications, where its low friction properties and ability to function without liquid lubricants make it valuable in extreme environments (vacuum, high temperature, radiation). WS₂ is increasingly investigated for next-generation devices including photodetectors, field-effect transistors, and catalytic systems due to its direct bandgap and superior electronic properties compared to traditional bulk materials.

solid lubricants and dry coatingsspace and vacuum applicationstwo-dimensional semiconductorsphotodetectors and optoelectronicscatalysis and energy storagehigh-temperature bearing surfaces

Compliance & Regulations

?EAR?Conflict Free?RoHS?REACH?TSCA?Prop 65
Units:
siimperial
PropertyValueUnitConditionsSource
Bulk Modulus(K)
10,332.5
ksi—
Exfoliation Energy(Eexf)
82.26
meV/atom—
Poisson's Ratio(ν)
0.2400
-—
Shear Modulus(G)
6,600.7
ksi—
Verified Unverified Low confidence (<80%) Link to source
PropertyValueUnitConditionsSource
Density(ρ)
0.1567
lb/in³—
Verified Unverified Low confidence (<80%) Link to source
PropertyValueUnitConditionsSource
Band Gap(Eg)
0.9450
eV—
Dielectric Constant (Relative Permittivity)(εr)2 entries
9.310
-—
↳
8.455
-—
Electronic Dielectric Tensor(ε∞)
Matrix (redacted)
-—
Total Dielectric Tensor(ε)
Matrix (redacted)
-—
Magnetic Moment(μB)
0.000
µB—
Piezoelectric Modulus(eij)
0.000
C/m²—
Seebeck Coefficient(S)
-454.5
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
PropertyValueUnitConditionsSource
Energy Above Hull(ΔEhull)
0.1394
eV/atom—
Formation Energy(ΔHf)2 entries
-0.8962
eV/atom—
↳
-0.8563
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.