Table 1.
Coordination number (N), DWF (σ2) and NN Fe-O bond length (R) obtained from fitted temperature-dependent EXAFS spectra at Fe K-edge for θ = 0° and 70°.
| Temperature | E//ab-plane (θ = 0°) | E//c-axis (θ = 70°) | ||||
|---|---|---|---|---|---|---|
| N | R (Å) | σ2 (Å−2) × 10−3 | N | R (Å) | σ2 (Å−2) × 10−3 | |
| 300 K | 4 | 2.00 ± 0.02 | 7.2 ± 0.3 | 1.2 | 1.87 ± 0.02 | 1.5 ± 0.3 |
| 200 K | 4 | 2.01 ± 0.02 | 3.5 ± 0.3 | 1.2 | 1.88 ± 0.02 | 1.7 ± 0.3 |
| 175 K | 4 | 2.01 ± 0.02 | 3.7 ± 0.3 | 1.2 | 1.88 ± 0.02 | 1.3 ± 0.3 |
| 150 K | 4 | 2.01 ± 0.02 | 2.5 ± 0.3 | 1.2 | 1.88 ± 0.02 | 1.1 ± 0.3 |
| 125 K | 4 | 2.03 ± 0.02 | 2.9 ± 0.3 | 1.2 | 1.88 ± 0.02 | 0.9 ± 0.3 |
| 115 K | 4 | 2.02 ± 0.02 | 5.1 ± 0.3 | 1.2 | 1.88 ± 0.02 | 2.1 ± 0.3 |
| 100 K | 4 | 2.00 ± 0.02 | 4.0 ± 0.3 | 1.2 | 1.88 ± 0.02 | 1.6 ± 0.3 |