Tritium release from neutron-irradiated Li2O sintered pellets: porosity dependence

Tritium release from neutron-irradiated Li2O: Transport in porous sintered pellets

“…specimens (a), which are irradiated by thermal neutrons up to a fluence of 2 × 10 23 n/m 2 , the temperature corresponding to the peak release rate is about 680 K. For the 88% T.D. specimens (b), which are irradiated by thermal neutrons up to a fluence of 2 × 10 22 n/m 2 , the temperature corresponding to the peak release rate is about 660 K. From the previous studies by the authors [2], the temperature corresponding to peak in the release curve for sintered pellet of 87-89% T.D. are about 50 K higher than those for sintered pellet of 71-86% T.D.…”

“…The authors have observed the annihilation behavior of the tritium trapping sites by annealing is not affected by density in the range from 71 to 86% T.D. [2]. Since the open porosity decreases from 26 to 11% and the grain diameter increases from 10 to 23 m, respectively, with an increase in density from 71 to 86% T.D., it suggests that the tritium release behavior is not affected by the porosity and the grain diameter [2,3].…”

“…The authors have investigated the porosity dependence of tritium release behavior for the specimens in the density range between 71 and 88% T.D. [2,3]. The results suggest that the tritium release mechanisms changes when the T.D.…”

“…This suggests that the tritium release mechanisms changes between 86 and 87% T.D. [2,3]. The migration process of moisture in heterogeneous porous ceramics is significantly affected by the structures of closed pore, the open pore and the connected micro-pore [4][5][6][7][8][9][10].…”

Development of the Tritium Transport Model for Pebbles of Li₂TiO₃

“…Many researchers suggested that the tritium release from the solid tritium breeding materials is controlled by the tritium diffusion in the grain [1][2][3]. Our previous study established a qualitative tritium migration model in a grain of lithium meta-titanate (Li 2 TiO 3 ) which is one of the promising candidate of the solid tritium breeding materials [4].…”