| Technetium (Tc) | |
| Atomic Number | 43 |
| Atomic Weight | 98.91 |
| Room Temperature Structure | hcp (A3) |
| Room Temperature Lattice Constant a | 0.274 nm |
| Room Temperature Lattice Constant c | 0.440 nm |
The tight-binding parameters were fit to first-principles Augmented Plane Wave (APW) results over the following ranges:
| Structure | Minimum Lattice Constant (Bohr) | Maximum Lattice Constant (Bohr) |
| fcc (A1) | 7.10 | 7.50 |
| bcc (A2) | 5.60 | 6.00 |
| Reference | Phys. Rev. B 54, 4519-30 (1996) | |
Use of the parameters outside of these ranges may result in unphysical behavior.