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The microstructures of different high-temperature prepared oxides of the (1− x )Y 0.5 Zr 0.5 O 1.75 − x Y 0.75 Nb 0.25 O 1.75 (0 ≤ x ≤ 1) system have been studied by selected-area electron diffraction and high-resolution transmission electron microscopy. The materials show a modulated fluorite-type structure mainly due to a partial or short-range ordering of the oxygen vacancies. The modulation is related to the pyrochlore-type structure in the Y 0.75 Nb 0.25 O 1.75 . A short-range ordering of the oxygen vacancies related to the C-type structure is observed in the Y 0.5 Zr 0.5 O 1.75 . Gradual transition from the pyrochlore to the C-type structures is established with the variation of the composition.
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García‐Martín et al. (2000) studied this question.
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