Add time:08/06/2019         Source:sciencedirect.com

Pyrochlore-type oxides having the formula Gd1.6Ce0.4Ti2O7+δδ have been synthesized by ceramic and co-precipitation methods and annealed at 1300 °C under different environments. Rietveld refinement of powder X-ray diffraction (XRD) patterns indicated that the products adopt the pyrochlore-type oxide structure with Ce ions substituting for Gd ions. Analysis of Ce 3d X-ray photoelectron spectroscopy (XPS) spectra confirmed the presence of both Ce3+ and Ce4+, which was corroborated by analysis of Ce L3-edge X-ray absorption near edge spectroscopy (XANES) spectra. Incorporation of Ce4+ imparts disorder on the Ti octahedra as observed by analysis of Ti K-edge XANES spectra. Due to the presence of Ce4+ in the A-site of the pyrochlore-type structure, oxygen is likely intercalated into the vacant anion 8b site to charge balance the system. This intercalation results in an increase of the average Ti coordination number from 6 to between 6 and 7, which leads to the formula unit being better represented as Gd1.6Ce0.4Ti2O7+δδ.

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