Phase | copper | tenorite | “siemonsite” | cuprite | paramelaconite |
Formula | Cu | CuO | T-CuO | Cu2O | Cu4O3-x |
Space group | Fm3m | C2/c (293 K) |
| Pn3m | I41/amd |
a (Å) | 3.6147 | 4.6837 | 3.905 | 4.2696 | 5.837 |
b (Å) |
| 3.4226 |
|
|
|
c (Å) |
| 5.1288 | 5.30 |
| 9.932 |
β (°) |
| 99.54 |
|
|
|
V (Å3) |
| 81.080 | 80.82 | 77.832 | 4 × 84.598 |
ρ (kg/m3) | 8.937 | 6.516 | 6.54 | 6.106 | 5.93 |
Cu-Cu (Å) | 2.5560 | 2.9005 3.0830 3.1733 | 2.761 | 3.0191 | 2.9185 |
ε |
| 5.9 || [010] 6.2 || [101] 7.8 || |
| 7.11 ε(0) 6.46 ε(∞) | 4.24 ε(∞)* |
ΘD (K) | 347 (0 K) 310 (298 K) | 391 |
| 188 |
|
vs (m/s) | 4.76 × 103 longitudinal 2.33 × 103 transverse | 6.4 × 103 [100] 4.1 × 103 [010] 7.8 × 103 [001] 5.4 × 103 [101] 9.1 × 103 6.8 × 103 [111] |
|
|
|
TN (K) |
| 213 230 |
|
| 45 - 55 120 |
Eg (eV) |
| 1.2 |
| 2.137 | 1.34 (indirect) 2.47 (direct) |