Irradiation effects and hydrogen behavior in H2+ and He+ implanted γ-LiAlO2 single crystals
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© 2016 Elsevier B.V. Gamma-phase lithium aluminate (γ-LiAlO2) is a breeder material for tritium, a necessary substance for strategic stockpile and fusion power systems. A fundamental study of structural evolution and tritium diffusion in γ-LiAlO2 under displacive irradiation is needed to fully assess the material performance. This study utilizes ion implantation of protium (surrogate for tritium) and helium in γ-LiAlO2 single crystals at elevated temperatures to emulate the irradiation effects. The results show that at 573 K there are two distinct disorder saturation stages to 1 dpa without full amorphization; overlapping implantation of H2+ and He+ ions suggests possible formation of gas bubbles. For irradiation to 1021 H+/m2 (0.36 dpa at peak) at 773 K, amorphization occurs at surface with H diffusion and dramatic Li loss; the microstructure contains bubbles and cubic LiAl5O8 precipitates with sizes up to 200 nm or larger. In addition, significant H diffusion and release are observed during thermal annealing.
author list (cited authors)
Jiang, W., Zhang, J., Kovarik, L., Zhu, Z., Price, L., Gigax, J., ... Senor, D. J.
complete list of authors
Jiang, Weilin||Zhang, Jiandong||Kovarik, Libor||Zhu, Zihua||Price, Lloyd||Gigax, Jonathan||Castanon, Elizabeth||Wang, Xuemei||Shao, Lin||Senor, David J