Sintering and electrical properties of (CeO_2)_(0.8)(Sm_2O_3)_(0.1) powders prepared by glycine-nitrate process

摘要

(CeO_2)_(0.8)(Sm_2O_3)_(0.2) (SDC) powders were prepared using the glycine-nitrate process (GNP) with different glycine/metal ratios. The phase identification, morphology and electrical properties of SDC powders were investigated by XRD, TEM and the AC impedance spectroscopy, respectively. It was found that the ratio of glycine/metal had a great effect on both the morphology and the sinterability of the powders as well as the conductivity of the sintered pellets. When the ratio is around the stoichiometric value (about 1.6), the loose powders possessed a foam-like structure. The bulk density of SDC pellets sintered at 1500 deg C could reach 95 percent only when the ratio of glycine to metal was in the range of 1.3-2.0. The conductivity increased with the ratio of glycine to metal till at the ratio of 1.7, and then decreased. The maximum conductivity of the sintered specimens was 0.082 Scm~(-1) at 800 deg C.