The chemical behavior of T that was produced in monocrystals, via the 6Li(n,α)T reaction, was investigated. It was found that nearly 100% of the T in the crystals existed in the T+ state. When the neutron-irradiated crystals were heated to 1073K in vacuum, almost all of the T was released in the form of HTO gas. The release rate was controlled by the diffusion of T in the crystals, and the diffusion coefficient (as determined for temperatures ranging from 580 to 670K) was described by:

D (cm2/s) = 0.00011 exp[-75.5(kJ/mol)/RT]

The observed T diffusivity in this material was the largest then known for Li-based oxide ceramics. This corresponded with the fact that the diffusivity of Li ions in crystals was the largest known for these ceramics.

T.Hayashi, S.Konishi, K.Okuno: Journal of Nuclear Materials, 1990, 170, 60-5