Nano-sized Y2O3-stabilized ZrO2 (YSZ) powders were prepared by the spray pyrolysis of solutions containing citric acid and ethylenediaminetetraacetic acid. The resulting hollow particles were heated at between 600 and 900οC and planetary milled to nano-sized powders that showed mixed crystal structures of monoclinic, cubic, and tetragonal phases. Pellets formed from the YSZ powders had fine grains of below 1μm after sintering at 1300 or 1400 οC. Sintering at 1500 οC led to large grains of 2.3 μm.

Keywords: Nano powders, Spray pyrolysis, Zirconica, Electrolyte material.