欠陥ペロブスカイトLaTa_3O_9の交流電気伝導と輸率測定

概要

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A.C.electrical properties of defect perovskite LaTa_30_9 were measured in the temperature range between 423 and 1073 K under oxygen partial pressures (P_<o2>) from 10 Pa to 0.1 MPa. Complex impedance spectra showed three dispersions associated with bulk, surface layer and a diffusion (Warburg) process. The conductivity of bulk was independent of P_<o2> and its activation energy. was 0.40 to 0.48 eV. The capacitance of bulk was 5 to 8 pF and independent of temperature. The conductivity of surface layer (σ2) increased with increasing P_<o2> as expressed by σ_2 ∝P_<o2> (n=0.14 to 0.18). The capacitance of surface layer increased from 3 to 20 nF and increased with increasing temperature. The ionic transport number measured with an oxygen concentration cell was nearly I at 750 K, and decreased with in creasing temperature.
社団法人日本セラミックス協会の論文
1995-01-01