10gdc, 10gdc/ceo2, 10gdc/y2o3 ve 10gdc/yb2o3 kompozitlerinin sentezi ve karakterizasyonu

In this study, 10 mol % gadolinium doped ceria was taken as a basic compound and new compositions with additional amounts of CeO2, Y2O3 and Yb2O3 in various ratios were prepared using sol-gel combustion synthesis technique. For comparison, all compounds were also synthesized by solid state reaction method. The annealing conditions (temperature and heating time) were identical for both synthesis routes. For the characterization of synthesized products, infrared (IR) spectroscopy, X-ray powder diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX) and scanning electron microscopy (SEM) were used. It was demonstrated that single-phase compounds synthesized by sol-gel combustion technique were obtained independent on the amount of CeO2, Y2O3 and Yb2O3 while in the case of solid-state reaction synthesis route the mixture of oxides was obtained. IR results showed that the final products of the sol-gel combustion technique after heating at 800 oC have identical bands compared to each other and rare earth oxides. XRD results showed that the sol-gel combustion products were single phase compounds with no additional phase; however, the solid state products have additional diffraction lines belonging to Gd2O3, Y2O3 and Yb2O3. SEM results showed that the morphology of particles does not depend on the nature and amount of addition of rare-earth oxide. EDX results were in a good agreement with nominal compositions of elements.