Correlation between annihilation of radiation defects and tritium release in Li2TiO3

D-depth profiling in as-implanted and annealed Li-based breeder blanket ceramics

“…Because of their properties (among others: high radiation resistance, low tritium retention and high tritium generation), Li-based ceramics are one of the most promising materials for breeder blankets [1]. In these materials the Tritium originates from the following nuclear reactions 6 Li (n, a) T or 7 Li (n, n a) T [2] taking place when the ceramics are irradiated with neutrons. The lost of T from neutron-irradiated lithium ceramics involves its diffusive motion within the solid and its subsequent release from the ceramic surface.…”

“…Moreover an additional factor, which has to be considered when studying T behaviour in irradiated materials, is the evolution of the microstructure during irradiation with energetic ions, neutrons and electrons [5]. A good number of in situ T release experiments testing several different irradiated materials have been carried out at different laboratories [6][7][8][9], the conclusions being that processes involved in the annihilation of radiation defects seem to play an important role to establish the T recovering system and the release behaviour.…”

Overview of research and development activities on fusion nuclear technologies in Japan

“…Fundamental studies for hydrogen isotope behavior in Li 2 O, Li 2 TiO 3 and so on have been also done at The University of Tokyo, Shizuoka University and Kyushu University [13,14].…”

Dependence of gamma-ray dose on annihilation processes of irradiation defects in Li2TiO3

“…Especially, from the viewpoint of stable operation of the reactors, it is necessary to study the correlation between the irradiation defects and tritium behavior. In our previous studies, Oyaidzu et al reported that the annihilation of irradiation defects triggered of tritium release at some of lithium ceramics [5,6]. On the other hand, the irradiation defects are generated by two processes.…”

“…Particularly, lithium titanate (Li 2 TiO 3 ) is selected as a candidate of tritium breeding materials (TBMs) due to its good tritium release, good tritium inventory, chemical stability and so on [1][2][3][4]. It is well known that in an operating fusion reactors, irradiation defects in Li 2 TiO 3 will be produced by neutrons, gamma-ray, recoil tritium and helium, which are productions by 6 Li(n, ␣)T and 7 Li(n, n ␣)T reactions. The generated tritium is also thermalized with forming irradiation defects and will occur hot-atom reaction, namely, unexpected reaction which cannot set off under thermal equilibrium.…”