Dynamic observation of the behavior of 3keV irradiated into Li2O using IR absorption spectroscopy

Existence states of deuterium irradiated into LiAlO2

“…A similar observation has been reported for a Li 2 O single crystal irradiated at 3 keV D þ 2 at room temperature, although the saturation fluence of the surface O-D is lower than that of the LiAlO 2 powder, at 6 Â 10 20 D þ 2 m À2 [14]. This discrepancy should be due to the difference between single crystal and powder.…”

“…Over the last few years, we have performed IR absorption analyses during deuterium ion irradiation, in order to observe directly the interactions between hydrogen isotopes and radiation defects. We have found that substitutional D + for Li + and the LiOD phase result from 3 keV D þ 2 irradiation at room temperature [13,14], while non-O-D states predominate by 1 MeV D + irradiation, probably because irradiation at this higher energy level induces a significant rate of F center formation [15,16]. This type of information on tritium and defects in Li 2 O should be applicable to ternary Li-containing oxides.…”

“…Therefore, the peak at 2706 cm À1 was designated as the LiOD phase that was formed in LiAlO 2 . Note that the LiOD phase is a minor existence state of irradiated deuterium in LiAlO 2 , although it is the dominant species in Li 2 O irradiated at 3 keV D þ 2 at room temperature with fluence > 1 Â 10 21 D þ 2 m À2 [14]. The peak at 2430 cm À1 appears to reflect some impurities on the surface of the sample, as its reproducibility was inconsistent.…”

“…These peaks were also detected for the LiAlO 2 single crystal, albeit with different intensities. It has been reported that the LiOD phase of Li 2 O has an O-D vibration peak of about 2710 cm À1 [14]. Therefore, the peak at 2706 cm À1 was designated as the LiOD phase that was formed in LiAlO 2 .…”

Overview of research and development activities on fusion nuclear technologies in Japan

“…Fundamental studies for hydrogen isotope behavior in Li 2 O, Li 2 TiO 3 and so on have been also done at The University of Tokyo, Shizuoka University and Kyushu University [13,14].…”