Abstract
The relations between the oxygen potentials and the excess oxygen‐nonstoichiometry (y) of the pyrochlore‐type Am2Zr2O7+y at 1333 K were measured by the electrochemical method using a zirconia solid electrolyte and the change of mass by oxidation and reduction. The oxygen potentials at 1333 K smoothly increased from −516.5 to 0.00 kJ/mol with increasing y from 0.00 to 0.56. It was found that the oxygen potentials of Am2Zr2O7+y were higher than those of AmO2−x and Am0.5Np0.5O2−x measured in our previous studies at 1333 K. The results were discussed with the valence state and ionic radius of cations as well as the phase relations.
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