Surface desorption and bulk diffusion models of tritium release from Li2TiO3 and Li2ZrO3 pebbles

Charge distribution and mobility of lithium ions in Li2TiO3 from 6,7Li NMR data

“…According to [14] in the 7 Li NMR spectra there are two pairs of satellite lines with quadrupole splitting frequencies (ν Q ) 21.0 kHz and 44.5 kHz, which were assigned to positions of lithium ions in the Li1-Li2 layer (ν Q = 21.0 kHz) and Li3-Ti 2 O 6 (ν Q = 44.5 kHz) based on the estimation of electric field gradients (EFG) in the point charge model. In [21], monoclinic lithium titanate was studied both experimentally by 6,7 Li NMR in the temperature range of 150-500 K and theoretically by the molecular dynamics method. In particular, it is shown that apart from octahedral Li1, Li2, and Li3 structural sites, lithium ions can occupy a tetrahedral site when a vacancy is present near it; one of the ways of lithium ion diffusion (along the crystallographic c axis between the lithium and LiTi 2 O 6 layers) is proposed.…”

“…Thus, it was proposed to use Li 2 TiO 3 lithium titanate as one of the components of the electrode material in lithium batteries [3,4] and fuel elements [5]. Monoclinic Li 2 TiO 3 has recently attracted attention as a breeder material in reactors with thermal neutrons due to a high tritium release rate at comparatively low temperatures (475-675 K), thermal stability, and chemical resistance [6][7][8].…”

Release behavior of hydrogen isotopes in deuterium-irradiated Li2TiO3

“…In the operation of a D-T fusion reactor, tritium is generated by the reactions of 6 Li (n, ␣) T in breeding blanket, such as solid pebble bed blanket and liquid lead lithium blanket. Due to energetic recoil tritium and helium atom of around 2-3 MeV, irradiation defects could be introduced into the solid tritium breeding materials and will trap tritium atoms.…”

“…solid tritium breeding materials. However, the experimental results are scattered, especially for diffusivities [2][3][4][5][6]. It can be said that the comprehensive model of tritium release kinetics is still not determined.…”

Effect of sweep gas species on tritium release behavior from lithium titanate packed bed during 14 MeV neutron irradiation

“…Hence, its analysis becomes difficult. The post-irradiation experiments also have been often carried out so far [5][6][7]. It was useful for investigation of the amount of tritium generated and the thermal desorption behavior of tritium.…”