Oxygen nonstoichiometry of the perovskite-type oxides BaCe0.9M0.1O3 − δ (MY, Yb, Sm, Tb, and Nd)

The measured δ of BaCe0.9Nd0.1O3 − δ was analyzed by considering the valence change of neodymium. By considering the defect equilibrium among Nd′Ce, Nd×Ce, VO
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- , and OO×, the change of δ against PO2 was well explained by assuming the defect equilibrium 12O2+VO
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- +2NdCe'=OO×+2NdCe×.