Carbonate Co-precipatatioin 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. © 2004 Elsevier B.V. All rights reserved.