Cu3Au
metal· Cu3Au
Cu3Au is an intermetallic compound composed of copper and gold in a 3:1 ratio, forming an ordered metallic phase with face-centered cubic structure. This material is primarily of research and specialized industrial interest rather than a commodity alloy, valued for its unique combination of stiffness and density that arises from its ordered atomic structure. While limited in high-volume production, Cu3Au finds application in precision electronics, wear-resistant coatings, and jewelry alloys where the color, hardness, and corrosion resistance of gold can be achieved at lower cost through copper alloying.
Intermetallic research compoundsPrecision electrical contactsWear-resistant coatingsHigh-end jewelry and decorative alloysMaterials science fundamental studiesCorrosion-resistant fasteners
Compliance & Regulations
?EAR?Conflict Free?RoHS?REACH?TSCA?Prop 65
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Bulk Modulus(K)2 entries | 20,559.4 | ksi | — | ||
| ↳ | 20,559.4 | ksi | — | ||
Elastic Compliance Tensor(Sij) | Matrix (redacted) | 1/GPa | — | ||
Elastic Anisotropy(AU) | 1.055 | - | — | ||
Elastic Stiffness Tensor(Cij) | Matrix (redacted) | ksi | — | ||
Poisson's Ratio(ν) | 0.3498 | - | — | ||
Shear Modulus(G)2 entries | 6,862.5 | ksi | — | ||
| ↳ | 6,862.5 | 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) | 0.4292 | lb/in³ | — |
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Band Gap(Eg) | 0.000 | eV | — | ||
Magnetic Moment(μB) | 0.000 | µB | — | ||
Seebeck Coefficient(S) | -11.12 | µV/K | — |
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Energy Above Hull(ΔEhull) | 0.000 | eV/atom | — | ||
Formation Energy(ΔHf) | -0.03892 | eV/atom | — |
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.