Electronic Conductivity of CeO2: Its Dependence on Oxygen Partial Pressure and Temperature

摘要

The electronic conductivity of pure ceria was successfully measured by a dc polarization technique based on the Hebb–Wagner ion blocking method at T = 873–1273 K. The electronic conductivity increased with increasing temperature at given PO2 values. It also increased with decreasing PO2 following slope values of 1/6 to 1/4. At 873–1073 K, no PO2 dependent region was observed at higher PO2 more than 102, 104, and 105 MPa at 1073, 973, and 873 K, respectively. Activation energies calculated from the Arrhenius plots for those different regions were 2.2, 2.9, and 1.9 eV for PO2 dependences of 1/6, 1/4, and 0 regions, respectively