IR observation on O–D vibration in LiNbO3 and LiTaO3 single crystal irradiated by 3keV

XPS analysis on chemical states of Li4SiO4 irradiated by 3keV

“…It was considered that desorption of deuterium as water forms should be due to -OD À on the surface of ternary lithium oxides. The existence of -OD À in deuterium-irradiated ternary lithium oxides has been supported by the FT-IR technique on observation of O-D vibration [9][10][11][12][13]. The assignments of Si-b, O-c and O-b in the present study also suggest the existence of -OD À in deuterium-irradiated Li 4 SiO 4 .…”

“…D + , will be attracted by neighboring oxygen ions to form O-D bond [12]. The O-D bond in D þ 2 -irradiated ternary lithium oxides [13] has been observed, therefore some 4 [16], which are close to O-c at 531.3 eV and Si-b at 104.2 eV. Otherwise the XPS peak for Si-2p at 102.5 eV in SiOH has been also reported [17], which is lower than that in Si(OH) 4 .…”

“…In the previous study it has been observed that deuterium implanted into ternary lithium oxides can be desorbed as hydrogen molecular forms (D 2 /HD) and water forms (D 2 O/HDO) [9][10][11][12][13], which is corresponding to that tritium produced in ternary lithium oxides can be released as HT and HTO. It was considered that desorption of deuterium as water forms should be due to -OD À on the surface of ternary lithium oxides.…”

“…There are a variety of ternary lithium oxides such as Li 4 SiO 4 and Li 2 TiO 3 that could be employed as a candidate solid breeding materials for D-T fusion reactor. Okuno et al [1][2][3][4], Oya et al [5][6][7] and Tanaka et al [8][9][10][11][12][13] have carried out some studies on behaviors of hydrogen isotopes in these ternary lithium oxides. Li 4 SiO 4 will be applied as tritium breeding materials in EU helium cooled pebble blanket (HCPB) and CN helium cooled solid blanket (HCSB).…”

“…Some surface analysis methods combined with deuterium implantation technical have contributed to the study on release behavior of hydrogen isotopes from various ternary lithium oxides affected by irradiation defects [1][2][3][4][5][6][7][8][9][10][11][12][13]. It has been observed that deuterium implanted into Li 4 SiO 4 can be desorbed as hydrogen molecular forms (D 2 /HD) and water forms (D 2 O/HDO), which is corresponding to that tritium produced in neutron-irradiated Li 4 -SiO 4 can be released as HT and HTO.…”