Microstructural evolution and precipitation in γ-LiAlO2 during ion irradiation

Jiang, Weilin; Kovarik, Libor; Zhu, Zihua; Varga, Tamas; Bowden, Mark E.; Matthews, Bethany E.; Hu, Zhihan; Shao, Lin; Senor, David J.

doi:10.1063/5.0089865

Microstructural evolution and precipitation in γ-LiAlO₂ during ion irradiation

Journal Article · Wed Jun 01 00:00:00 EDT 2022 · Journal of Applied Physics

DOI:https://doi.org/10.1063/5.0089865· OSTI ID:1884574

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Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Texas A & M Univ., College Station, TX (United States)

Polycrystalline γ-LiAlO₂ pellets were sequentially irradiated with 120 keV He⁺ and 80 keV D₂⁺ ions to the fluences of 1 × 10¹⁷ and 2 × 10¹⁷ (He⁺+ D⁺)/cm² at 573 K. Additional irradiation was performed to a fluence of 2 × 10¹⁷ (He⁺+ D⁺)/cm² at 773 K. The irradiated pellets were characterized using scanning transmission electron microscopy, time-of-flight secondary ion mass spectrometry, and grazing incidence x-ray diffraction. Lattice damage, amorphization, and fractures are observed with no evidence for the formation of secondary-phase precipitates in the pellets irradiated up to an ion fluence of 2 × 10¹⁷ (He⁺+ D⁺)/cm² at 573 K. In contrast, faceted precipitates with sizes larger than 100 nm formed in a pellet irradiated to 2 × 10¹⁷ (He⁺+ D⁺)/cm² at 773 K. Analyses of the diffraction and composition data suggest that the precipitates have a spinel-type structure, likely a non-stoichiometric LiAl₅O₈ with Li depletion. This could be an intermediate phase with Li atoms at the octahedral and possibly tetrahedral sites as well. It is speculated that as the dose increases, Li loss will continue and the precipitates will approach a composition of alumina primarily in phases of α-Al₂O₃ and amorphized Al₂O₃.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1884574

Alternate ID(s):: OSTI ID: 1870726

Report Number(s):: PNNL-SA-170674

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 21 Vol. 131; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
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