Nanometre-sized Gd-doped ceria (GDC) particles were prepared by alternating and direct current electrolysis of mixed aqueous solutions containing Ce3+ ions (0.08 mol/l) and Gd3+ ions (0.02 mol/l) at 25 o-80 oC for 24 h under an electric field strength of 3.3 V/cm. The GDC particles of the median sizes of 2.4-5.6 nm were produced under an AC field at 1 Hz of 3.3 V/ cm, and the particle size and yield increased at a higher solution temperature. The increase of solution pH was also effective in increasing the particle yield. The addition of glycine to the Gd(NO3)3-Ce(NO3)3 solution increased the particle yield at a low electrolysis temperature under a DC field of 3.3 V/cm. The Gd2O3 content of the GDC particles produced in the glycinecontaining solution was close to the metal composition of the starting solution.

Keywords: Organic compound, Gadolinium-doped ceria, Nanoparticles, Electrolysis.