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Synthesis of(Gd0.95-xLnxEu0.05)2O3(Ln=Y,Lu,x=0-0.95)powders via ammonium hydrogen carbonate(AHC)precipitation has been systematically studied.The effects of Y3+ and Lu3+ substitution for Gd3+ on the nucleation kinetics of the precursors,and structural features and optical properties of the oxides have been investigated.The results show that(1)different nucleation kinetics exist in the Gd-Y-Eu and Gd-Lu-Eu ternary systems,which leads to various morphologies and particle sizes of the precipitated precursors.