Table 2. EPR fit parameters derived from the best fits to the Hamiltonian (1) of the perpendicular mode spectra of the gadolinium powder samples at 2% molar concentration in the respective yttrium hosts. The off-diagonal sixth order terms could not be reliably included in the fit for 1Y0.98Gd0.02′.
| 1Y0.98Gd0.02 | 2Y0.98Gd0.02 | 1Y0.98Gd0.02′ | 2Y0.98Gd0.02′ | |
| g ∥ | 1.9865(3) | 1.9880(2) | 1.979(1) | 1.984(1) |
| g ⊥ | 1.98552(4) | 1.98690(7) | 1.9862(8) | 1.9843(1) |
| B 0 2 /cm–1 | 3.2378(5) × 10–2 | 3.0553(5) × 10–2 | 8.8(1) × 10–3 | 1.071(4) × 10–2 |
| B 0 4 /cm–1 | –2.605(4) × 10–4 | –2.480(2) × 10–4 | –2.0(1) × 10–4 | –2.04(3) × 10–4 |
| B 0 6 /cm–1 | –2.8(7) × 10–8 | 4(2) × 10–8 | –1(6) × 10–7 | –5(5) × 10–7 |
| B +4 4 /cm–1 | 1.4(5) × 10–6 | 1.4(2) × 10–6 | 1.9(3) × 10–5 | 6(6) × 10–6 |
| B +4 6 /cm–1 | 1.62(5) × 10–6 | 2.0(3) × 10–7 | N/A | –1.3(7) × 10–6 |
| B –4 6 /cm–1 | –6.1(2) × 10–7 | 3.6(3) × 10–7 | N/A | –2(3) × 10–7 |