Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 494, Issue -, Pages 411-421Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2017.07.048
Keywords
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Funding
- PNNL Tritium Technology Program - National Nuclear Security Administration, U.S. Department of Energy
- DOE Office of Biological and Environmental Research
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In-situ He+ ion irradiation is performed under a helium ion microscope to study nanostructural evolution in polycrystalline gamma-LiAlO2 pellets. Various locations within a grain, across grain boundaries and at a cavity are selected. The results exhibit He bubble formation, grain-boundary cracking, nanoparticle agglomeration, increasing surface brightness with dose, and material loss from the surface. Similar brightening effects at grain boundaries are also observed under a scanning electron microscope. Li diffusion and loss from polycrystalline gamma-LiAlO2 is faster than its monocrystalline counterpart during H-2(+) ion implantation at elevated temperatures. There is also more significant H diffusion and release from polycrystalline pellets during thermal annealing of 300 K implanted samples. Grain boundaries and cavities could provide a faster pathway for H and Li diffusion. H release is slightly faster from the 573 K implanted monocrystalline gamma-LiAlO2 during annealing at 773 K. Metal hydrides could be formed preferentially along the grain boundaries to immobilize hydrogen. (C) 2017 Published by Elsevier B.V.
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