Abstract
This work presents results of HRTEM and XRD studies on microstructure of ceria-based mixed oxides subjected to high-temperature heat treatment in air. Nano-sized (4-5 nm) crystallites of Ce(0.5)Ln(0.5)O(1.75) oxides (Ln = Yb, Lu) with narrow size distribution were prepared by a microemulsion method (W/O). Presence of an intermediate cubic phase, with oxygen vacancy ordering, was found for the Ce(0.5)Ln(0.5)O(1.75) mixed oxides. A simple model of the intermediate phase has been proposed and tested.
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