Nanocrystalline materials Lu2O3-TiO2 (33.3–44mol%Lu2O3) with a partially disordered pyrochlore structure, prepared via heat treatment at 1400 to 1750C, were found to possess a high O ionic conductivity. Their 740C conductivity was 10-3 to 10-2S/cm, depending upon the heat-treatment temperature and composition, which was comparable to that of the well-known fluorite solid electrolyte ZrO2-9mol%Y2O3.

Ionic Conductivity in the Lu2O3-TiO2 System. A.V.Shlyakhtina, A.V.Mosunov, S.Y.Stefanovich, A.V.Knotko, O.K.Karyagina, L.G.Shcherbakova: Inorganic Materials, 2005, 41[3], 264-71