Hydrogen Isotope Research Center - Toyama Univ.
Data Base for Tritium Solid Breeding Materials (Li2O, Li2TiO3, Li2ZrO3 and Li4SiO4) of Fusion Reactor Blankets --- Yoshiaki FUTAMURA
6. Database for Li2ZrO3
6.5 Irradiation effects
6.5.1 Physical integrity
| No. | Data and remark | Fig. | Refs. |
| 1 | Very good | - | 12, 77 |
6.5.2 Swelling
| No. | Data and remark | Fig. | Refs. |
| 1 | Swelling : Less than 0.7%. | - | 12, 49, 77 |
| 2 | Thermal expansion : No significant change. | - | 12, 73 |
| 3 | Volumetric Swelling of Li2ZrO3 at 700°C. | 6.4 | 49 |
| 4 | Diameter Swelling of Li2ZrO3 at 500°C, 700°C, 900°C. | 6.5 | 70 |
6.5.3 Grain growth
| No. | Data and remark | Fig. | Refs. |
| 1 | No change | - | 12, 36 |
6.5.4 Li transport
| No. | Data and remark | Fig. | Refs. |
| 1 | No change. Burn-up dependence of Li-transfer for Li2O, Li2ZrO3 and Li4SiO4. | 4.28 | 12, 95, 56 |
6.5.5 Thermal conductivity
| No. | Data and remark | Fig. | Refs. |
| 1 | No significant change. | - | 12, 73 |
| Notes1 | Thermal conductivity κ= α·Cp·ρ (W/m-K)
α : Thermal diffusivity (m2/s) Cp : Specific heat (J/g-K) ρ : Density (g/m3) |
- | - |
6.5.6 Young's modulus
| No. | Data and remark | Fig. | Refs. |
| 1 | ~30% increase. | - | 12, 73 |
6.5.7 Tensile strength --- No data
6.5.8 Compressive strength
| No. | Data and remark | Fig. | Refs. |
| 1 | Significant decrease, not in agreement with bending strength behavior. | - | 12, 73 |
6.5.9 Bending strength
| No. | Data and remark | Fig. | Refs. |
| 1 | Scattered values available. | - | 12, 73 |
6.5.10 Tritium diffusivity
| No. | Data and remark | Fig. | Refs. |
| 1 | No single crystal data. | - | - |
| 2 | Diffusion Coefficient of Tritium in Oxide Ceramic Breeder Materials is shown in the following Appendix 6.5.10 | - | 42, 43, 44, 45 |
| 3 | Summary of Tritium Diffusion Coef. in Li2ZrO3, Li2O and Li4SiO4. | 6.6 | 18 |
Appendix 6.5.10 Diffusion Coefficient of Tritium in Oxide Ceramic Breeder Materials.6, 42, 43, 44, 45)
| Material | Neutron fluence (cm-2) |
LogD0 (cm2-s-1) |
Q (kJ-mol-1) |
Temp. range (K) |
| Li2O | 8.1×1016 | –4.1±0.5 | 77.4±5.6 | 570~690 |
| Li2ZrO3 | 2.5×1016 | –4.9±0.2 | 75.0±2.2 | 540~730 |
| Li4SiO4 | 2.5×1016 | –6.7±0.1 | 43.8±0.9 | 530~850 |
6.5.11 Tritium residence time (hr)
| No. | Data and remark | Fig. | Refs. |
| 1 | τ=1.089×10-19exp(230.5 kJ·mol-1/RT), (hr)
T≧58 K, 0.5≦dg≦1μm, 20≦p≦25%, He+0.1% He purge |
- | 12, 47, 50, 36 |
| 2 | Tritium Residence Times for Li2ZrO3. | 6.7 | 12 |
6.5.12 Tritium release
| No. | Data and remark | Fig. | Refs. |
| 1 | Isothermal tritium release at 300°C, 250°C, 200°C, in He+0.1% H2 purge gas, flow rate 2.4h-1 for Li2ZrO3. | 6.8 | 50, 51 |
| 2 | Tritium desorption curves for Li2TiO3 and Li2ZrO3 pebbles at a linear heating rate of 2 K/min, pure He sweep gas. | 6.9 | 27 |
| 3 | Tritium adsorption : No data | - | 12 |
6.5.13 Tritium retention
| No. | Data and remark | Fig. | Refs. |
| 1 | Tritium retention in Li2ZrO3, Li2O and Li4SiO4 at 700°C. | 6.10 | 49, 50, 48 |
6.5.14 Helium retention
| No. | Data and remark | Fig. | Refs. |
| 1 | Very low | - | - |
| 2 | Helium Retention in Li2ZrO3, Li2O and Li4SiO4 after irradiation. | 6.11
6.12 |
48 |
6.5.15 After heat (W/cm3)
| No. | Data and remark | Fig. | Refs. |
| 1 | 6 W/cm3, 15 MW. yr/m2 fluence, 1-hr cooling, 85%TD
no impurities : tritium retained in breeder |
- | 62, 65, 90 |
| 2 | 0.05 W/cm3, 12.5 MW. yr/m2 fluence, 1-hr cooling, 85%TD
no impurities or tritium |
- | 62, 65, 91 |
6.5.16 Class C waste disposal rate
| No. | Data and remark | Fig. | Refs. |
| 1 | 24%, at 15 MW. yr/m2 fluence, 10-yr cooling, 85%TD | - | 62, 90 |
| Notes1 | For the base case with no impurities, the U.S. Class C waste disposal rating for Li2TiO3 is roughly equal to that for Li2O and Li4SiO4, and more than 10 times lower than for Li2ZrO3. | - | 65 |
