Carbonate Co-precipitation of Gd2O3-doped CeO2 solid solution nano-particles

This paper reports on the synthesis of 20 mol% Gd2O3-doped CeO2 solid solution (20 GDC) nano-particles via carbonate co-precipitation. Precursors and calcined particles were characterized using TGA, XRD, BET, FESEM, and TEM. From the diffraction pattern using XRD with TEM, it was shown that the Gd3+ replaced the Ce4+ lattice in the fluorite structure (FCC) of CeO2, as opposed to it being a second phase in the CeO2 structure. The 20 GDC particles were calcined at 700 °C for 2 h, and sintered to >99% density at a very low sintering temperature of 1150 °C for 4 h.