Vaporization behaviors of Cs2U4O12were studied by using the Knudsen effusion mass spectrometric method at temperatures from 1273 to 1573 K. To clarify vaporization properties of Cs2U4O12in case of severe accident conditions of light water reactors, partial pressure measurements were made in D2O/D2mixtures. The D2O/D2environments were established in the Knudsen cell by introducing D2(g) or D2(g) + O2(g) gas into the cell through a fine platinum tube attached to the bottom of the cell. Cesium vapor Cs(g) was found as the dominant vapor species over the compound either in vacuum or in the simulated atmospheres. In this study, the average temperature applied was 1423 K, the pressure of Cs(g) over the specimen in vacuum was 1.97 Pa while the oxygen potential measured was -148.2 kJ/mol. The pressure of Cs(g) increased moderately to 2.26 Pa after the introduction of the D2(g), and it decreased slightly to 1.56 Pa with the admission of D2(g)+O2(g).
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