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Perovskite oxides BaCe 1-x Eu x O 3-δ (x = 0.05, 0.10, 0.15, and 0.20) were prepared using starting ratios of Ba/(Ce + Eu) = 1.0 and 1.1. X-ray diffraction analysis shows that preparations with a slight initial barium excess crystallized as a single perovskite phase, while the stoichiometric preparations crystallized with a trace of CeO 2 due to...
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