Abstract
Oxide ion conductivity was examined in BaxCe0.8Ln0.2O3-δ (0.8{less than or equal to}x{less than or equal to}1.1; Ln=Lanthanoid). The slightly Ba-deficient compositions showed a higher conductivity than the nominal stoichiometric ones. A maximum total (bulk) conductivity (σ=5.5×10-4 Scm-1 at 250ºC, σ=9.6×10-3 Scm-1 at 500oC) was found in the Ba-deficient composition Ba0.975Ce0.8Gd0.2O3-δ. The σ value at 250oC was nearly two times higher than that of the known BaCe0.8Gd0.2O3-δ electrolyte. The conductivity is the best of those of known oxide ion conductors at intermediate temperatures. The non-stoichiometric Ba0.975Ce0.8Gd0.2O3-δ sample was a single phase of the monoclinic perovskite-related phase (I2/m). The high conductivity is attributed to the fact that the Gd-doped composition had the largest cell volume in the Ln-doped series. The unusual variation of the cell volume was due to a change in the portioning of the Ln ion between the B-site and the A(Ba)-site.
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