Material systems such as U–Zr–O, Fe–Zr–O, and Zr–O have been recognized as fundamental for the analysis of in-vessel nuclear fuel debris behavior during a severe meltdown accident. In the presentwork, the evaporation behavior of ZrO2 and Zr–Fe–Osystems are investigated using heating with laser pulses of millisecond duration and time-of-flight mass spectrometry. The relative partial pressures of main species of vapor over ZrO2 and ZrO2–FeO systems were measured at temperatures above 2750 K. The temperature dependence of O/Zr atomic ratio in vapor over zirconia was analyzed: it turned out that evaporation occurs in a non congruent mode at temperatures above 3000 K. Evaporation of the Zr–Fe– O system was greatly affected by the fast evaporation of FeO, implying that the atomic Zr/Fe ratio, less than 0.1 below 3000 K, significantly increased with temperature. Moreover, the ratios of main vapor components were defined only by the surface temperature, independent of the zirconia sample origin.
SHEINDLIN M.;
FROLOV Alexander;
PETUKHOV Sergei;
BOTTOMLEY Paul David William;
MASAKI Kurata;
MANARA Dario;
COSTA Davide;
2022-01-13
WILEY
JRC126640
0002-7820 (online),
https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.18185,
https://publications.jrc.ec.europa.eu/repository/handle/JRC126640,
10.1111/jace.18185 (online),
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