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

par Gregori, Giacomo ;Tsisar, Valentyn;Doneux, Thomas ;Lim, Jun
Référence Journal of nuclear materials, 589, 154866
Publication Publié, 2023-12-06

Article révisé par les pairs

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Résumé :

This study aims to investigate the chemistry of the Ni-O-Pb-Bi system through a combined microscopic andelectrochemical analysis of the Ni-NiO-NiBi3 equilibrium in molten lead-bismuth eutectic (LBE). Through SEMEDXmetallographic characterization, we examined to the precipitates formed on the solid nickel substrate inmolten LBE, confirming the formation of the NiBi3 within the temperature range of 469–748 K. Subsequently, weinduced the Ni(LBE)-NiO(s)-NiBi3(s) ternary equilibrium in LBE and measured the equilibrium oxygen concentrationsat different temperatures. The equilibrium nickel activity was derived using the measured equilibriumoxygen concentration in the temperature range of 518–595 K. Finally, the Ni-Bi IMCs floating on LBE at the endof the measurements were collected and characterized by X-ray diffraction (XRD), confirming the presence of theNiBi3 phase.