Thermal desorption behavior of hydrogen isotopes interacting with radiation defects in Li2O

In order to understand the influence of radiation defects on hydrogen isotope behavior in Li2O, thermal desorption spectroscopy (TDS) was applied to single-crystal samples into which deuterium had been introduced by two different methods: deuterium ion irradiation or deuterium thermal absorption. In both cases, a sharp peak of water species was observed at 680 K due to the decomposition of the LiOD phase. Additionally, two desorption peaks, one corresponding to HDO at 870 K and the other to HD/D2 at 900 K, were found for the irradiated sample. A comparison with the literature regarding these two desorption peaks at this stage suggested that the former desorption was due to D+ diffusing in the bulk, while the latter was due to D− trapped by the F0 centers or the deuterium bubbles.