Lithium sol-gel ceramics for tritium breeding applications
1995; Elsevier BV; Volume: 223; Issue: 2 Linguagem: Inglês
10.1016/0022-3115(95)00018-6
ISSN1873-4820
AutoresO. Renoult, J.P. Boilot, Jean‐Pierre Korb, M. Boncœur,
Tópico(s)Advanced Data Storage Technologies
ResumoTritium release experiments are performed on different lithium sol-gel ceramics showing identical microstructures. For γ-LiAlO2 type ceramics [Li4+xAl4−3xSi2xO8 (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-LiAlO2 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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