Table 1. Summary of the physical parameters derived from electrical, specific heat, and optical measurements for LixFe7Se8.
IR and Cp are the data extracted from infrared spectra and specific heat measurements, respectively.
| LixFe7Se8 | x = 0 (Fe7Se8) | x = 0.53 | x = 0.89 |
| σ300K (Ω−1 cm−1) | 3,300 | 1,277 | 877 |
| σ2K (Ω−1 cm−1) | 4,386 | 77 | 0.86 |
| ωp (cm−1) | 11,300 | 11,000 | 10,700 |
| nIR (cm−3) | 4.3 × 1021 | 4.0 × 1021 | 3.8 × 1021 |
| nCp (cm−3) | 4.6 × 1021 | 2.2 × 1021 | 2.1 × 1020 |
| N(EF)IR (m−3 J−1) | 1.2 × 1047 | 1.18 × 1047 | 1.16 × 1047 |
| N(EF)Cp (m−3 J−1) | 1.3 × 1047 | 9.7 × 1046 | 4.5 × 1046 |
| nIR(x)/nIR(Fe7Se8) | 100% | 93% | 88% |
| nCp(x)/nCp(Fe7Se8) | 100% | 48% | 5% |
| nc | — | 4 × 1014 | 9.5 × 1018 |
| nIR/nc | — | 1 × 107 | 4 × 102 |
| μ300K (cm3/V s) | 4.8 | 2 | 1.4 |
| μ2K (cm3/V s) | 6.0 | 0.2 | 2.6 × 10−2 |
| T0 (K) | — | ~0.2 | 5,373 |
| ξ (Å) | Inf | ~360 | 12.3 |