Abstract
Yttria-50vol% magnesia composite nanopowders with a high specific surface area were synthesized by the Pechini sol–gel method. The influences of the mole ratio of citric acid (CA) to transition metals (TM) and the calcination temperature on the properties of the MgO-Y2O3 composite nanopowder were investigated. As-synthesized samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscope (FESEM), transmission electron microscope (TEM), thermal gravimetric-differential thermal analysis (TG/DTA) and Fourier transform infrared (FTIR) analysis. The optimized sample synthesized with CA to TM molar ratio of 10:1, had the average grain size of 10–15nm with 85.14m2/g specific surface area. Decreasing the calcination temperature from 800 to 600°C, increased the specific surface area from 85.14m2/g to 134.92m2/g. The FESEM results showed that MgO and Y2O3 phases had a uniform distribution phase in MgO-Y2O3 composite.
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