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Title: Irradiation effects and hydrogen behavior in H2+ and He+ implanted γ-LiAlO2 single crystals

Abstract

Gamma-phase lithium aluminate (gamma-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 gamma-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 gamma-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 1E21 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.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1340742
Report Number(s):
PNNL-SA-114795
Journal ID: ISSN 0022-3115; 49138; 48707; 49576; MB0503000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Nuclear Materials; Journal Volume: 484; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
Defect accumulation; microstructure; H diffusion and release; ion implantation; tritium breeding material; lithium aluminate; Environmental Molecular Sciences Laboratory

Citation Formats

Jiang, Weilin, Zhang, Jiandong, Kovarik, Libor, Zhu, Zihua, Price, Lloyd, Gigax, Jonathan, Castanon, Elizabeth, Wang, Xuemei, Shao, Lin, and Senor, David J. Irradiation effects and hydrogen behavior in H2+ and He+ implanted γ-LiAlO2 single crystals. United States: N. p., 2017. Web. doi:10.1016/j.jnucmat.2016.03.014.
Jiang, Weilin, Zhang, Jiandong, Kovarik, Libor, Zhu, Zihua, Price, Lloyd, Gigax, Jonathan, Castanon, Elizabeth, Wang, Xuemei, Shao, Lin, & Senor, David J. Irradiation effects and hydrogen behavior in H2+ and He+ implanted γ-LiAlO2 single crystals. United States. doi:10.1016/j.jnucmat.2016.03.014.
Jiang, Weilin, Zhang, Jiandong, Kovarik, Libor, Zhu, Zihua, Price, Lloyd, Gigax, Jonathan, Castanon, Elizabeth, Wang, Xuemei, Shao, Lin, and Senor, David J. Wed . "Irradiation effects and hydrogen behavior in H2+ and He+ implanted γ-LiAlO2 single crystals". United States. doi:10.1016/j.jnucmat.2016.03.014.
@article{osti_1340742,
title = {Irradiation effects and hydrogen behavior in H2+ and He+ implanted γ-LiAlO2 single crystals},
author = {Jiang, Weilin and Zhang, Jiandong and Kovarik, Libor and Zhu, Zihua and Price, Lloyd and Gigax, Jonathan and Castanon, Elizabeth and Wang, Xuemei and Shao, Lin and Senor, David J.},
abstractNote = {Gamma-phase lithium aluminate (gamma-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 gamma-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 gamma-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 1E21 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.},
doi = {10.1016/j.jnucmat.2016.03.014},
journal = {Journal of Nuclear Materials},
number = C,
volume = 484,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}