Experimental Study on the Release Behavior of Deuterium from Advanced Tritium Breeder Core-Shell Li₂TiO₃-Li₄SiO₄

Core-shell Li₂TiO₃-Li₄SiO₄ has been suggested as an advanced tritium breeder for outstanding mechanical strength and rich lithium. However, no study has reported on the release behavior of hydrogen isotopes from core-shell Li₂TiO₃-Li₄SiO₄. This paper focuses on a deuterium exposure experiment to investigate deuterium release behavior. X-ray diffraction, Raman, and electron spin resonance measurements were adopted to analyze the phase change, crystal structure modification, and defects before and after deuterium exposure. Thermal desorption spectroscopy was used to study the deuterium release behavior of core-shell Li₂TiO₃-Li₄SiO₄. Deuterium release from single Li₄SiO₄ and Li₂TiO₃ was also examined for comparison. The similarity of the deuterium release profiles between core-shell Li₂TiO₃-Li₄SiO₄ and Li₄SiO₄ was observed, which was considered to be caused by the incomplete coverage of shell Li₂TiO₃ on the core-shell samples.