Journal
CORROSION SCIENCE
Volume 171, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.108721
Keywords
Yttrium-doped thoria; Sodium corrosion; Electrical properties; Impedance spectroscopy; Oxygen monitoring sensors
Funding
- CEA
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Within the development of SFR nuclear reactors, yttrium-doped thoria has been suggested by previous researchers as an electrolyte in sensors monitoring oxygen in liquid sodium. In this paper, Th1-xYxO2-x/2 electrical properties were assessed by impedance spectroscopy before their chemical durability was evaluated in liquid sodium. Pellets always kept their mechanical integrity although sodium penetration was evidenced through the modification of the cleavage surfaces. Post-immersion impedance spectroscopy showed a decrease of grain boundary contribution, even if the global conductivity was not significantly affected. These good performances could be strongly affected by the presence of impurities since silicon-doping increased the sodium penetration.
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