Table 1 Explanation of curves I-V in Fig. 3 and the values of calculated migration energy Ea and pre-exponential factor X obtained under different irradiation conditions for the electron (Nos.1–12) and hole (Nos. 13 and 14) centers.
No. | Irradiation | Defect | Ea (eV) | X (K−1) | Legend |
|---|---|---|---|---|---|
1 (I) | neutron | F | 0.38 | 1.0 × 101 | Optical absorption, single crystal, 1 MeV, Φ = 1.0 × 1017 n/cm2 |
2 | neutron | F+ | 0.35 | 5.1 × × 100 | same as No. 1 |
3 (II) | neutron | F | 0.44 | 1.3 × 101 | Optical absorption, single crystal, 1 MeV, Φ = 2.6 × 1018 n/cm2, |
4 | neutron | F+ | 0.35 | 3.0 × 100 | same as No. 3 |
5 (III) | protons | F | 0.60 | 1.4 × 102 | Optical absorption, ceramics with grain size 12 μm, 100 keV, Φ = 1.0 × 1017 p/cm2 |
6 | protons | F+ | 0.58 | 9.4 × 101 | same as No. 5 |
7 (IV) | proton | F | 0.24 | 8.5 × 10−2 | Optical absorption, ceramics with grain size 1.4 μm, 100 keV, Φ = 1.0 × 1017 p/cm2 |
8 | proton | F+ | 0.24 | 8.7 × 10−2 | same as No. 7 |
9 | proton | F | 0.29 | 3.4 × 10−1 | Optical absorption, ceramics with grain size 1.4 μm, 100 keV, Φ = 5.0 × 1017 p/cm2 |
10 | proton | F+ | 0.22 | 9.3 × 10−2 | same as No 9 |
11 | proton | F | 0.34 | 1.1 × 100 | Optical absorption, ceramics, grain size 0.5 μm, 100 keV, Φ = 2.0 × 1017 p/cm2 |
12 | proton | F+ | 0.38 | 3.1 × 100 | same as No. 11 |
13 (V) | neutron | V2 | 0.64 | 2.5 × 102 | EPR signal, single crystal 1 MeV, Φ = 2.6 × 1018 n/cm2 |
14 | neutron | V1 | 0.63 | 1.9 × 105 | same as No. 13 |
