Abstract
Tritium release experiments are performed on different lithium sol-gel ceramics showing identical microstructures. For γ-LiAlO 2 type ceramics [Li 4+ x Al 4−3 x Si 2 x O 8 (0:5 x:5 0.25)], the increase of the concentration of silicon atoms leads to a reduction of the temperature at which the tritium release curve reaches a maximum. This corresponds to a decrease of diffusion and desorption activation energies and can be related to the acidity of silanol groups which improves the tritium ion mobility. Compared to γ-LiAlO 2 type ceramics, the tritium release takes place at lower temperatures for lithium zirconate and titanate ceramics. Lithium titanate ceramics present a well resolved release peak, at 300°C, associated with a very low value of the desorption energy. This could be related to the presence of reducing non-stoichiometry defects at the ceramic surface.
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