Electrochemical and metallographic characterization of Ni-NiO-NiBi3 equilibrium in molten lead-bismuth eutectic

    Research outputpeer-review

    Abstract

    This study aims to investigate the chemistry of the Ni-O-Pb-Bi system through a combined microscopic and electrochemical analysis of the Ni-NiO-NiBi 3 equilibrium in molten lead-bismuth eutectic (LBE). Through SEM-EDX metallographic characterization, we examined to the precipitates formed on the solid nickel substrate in molten LBE, confirming the formation of the NiBi 3 within the temperature range of 469–748 K. Subsequently, we induced the Ni (LBE)-NiO ( s )-NiBi 3(s) ternary equilibrium in LBE and measured the equilibrium oxygen concentrations at different temperatures. The equilibrium nickel activity was derived using the measured equilibrium oxygen concentration in the temperature range of 518–595 K. Finally, the Ni-Bi IMCs floating on LBE at the end of the measurements were collected and characterized by X-ray diffraction (XRD), confirming the presence of the NiBi 3 phase.

    Original languageEnglish
    Article number154866
    Number of pages10
    JournalJournal of Nuclear Materials
    Volume589
    DOIs
    StatePublished - Feb 2024

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics
    • Materials Science(all)
    • Nuclear Energy and Engineering

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