Data were presented on the evolution of the pyrochlore structure in Gd2Hf2O7 compounds prepared from mechanically activated oxide mixtures. At 1300 to 1670C, Gd2Hf2O7 had a disordered pyrochlore structure. The highest 840C conductivities were exhibited by Gd2Hf2O7 synthesized at 1670C: with 5 x 10−3S/cm.

Structure and Electrical Conductivity of Ln2+xHf2−xO7−x/2 (Ln = Sm-Tb; x = 0, 0.096). A.V.Shlyakhtina, M.V.Boguslavskii, S.Y.Stefanovich, I.V.Kolbanev, A.V.Knotko, O.K.Karyagina, S.A.Borisov, L.G.Shcherbakova: Inorganic Materials, 2006, 42[5], 519-27