LAUSR

Abstract Li 2 TiO 3 -Li 4 SiO 4 biphasic ceramic pebbles have been developed as an advanced tritium breeder due to the potential to combine the advantages of both Li 2 TiO 3 and Li 4 SiO 4 . Wet method was developed for the pebble fabrication and Li 2 TiO 3 -Li 4 SiO 4 biphasic ceramic pebbles were successfully prepared by wet method using the powders synthesized by hydrothermal method. The tritium release properties of the Li 2 TiO 3 -Li 4 SiO 4 biphasic ceramic pebbles were evaluated. The biphasic pebbles exhibited good tritium release property at low temperatures and the tritium release temperature was around 470 °C. Because of the isotope exchange reaction between H 2 and tritium, the addition of 0.1%H 2 to purge gas He could significantly enhance the tritium gas release and the fraction of molecular form of tritium increased from 28% to 55%. The results indicate that the Li 2 TiO 3 -Li 4 SiO 4 biphasic ceramic pebbles fabricated by wet method exhibit good tritium release property and hold promising potential as advanced breeder pebbles.