Oxygen Ion Conduction of the Fluorite‐Type Ce1 − x Ln x O 2 − x / 2 ( Ln = Lanthanoid Element )

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Abstract
The compounds have been synthesized and the emf and resistivity measurements have been carried out between 400° and 1000°C. It is found that charge carriers of conduction in these compounds are oxygen ions above 600°C; the oxygen transference number being above 0.95 for all measured compounds. The resistivity value for is 15 ohm‐cm at 750°C which compares with that of calcia stabilized zirconia at 1000°C. It is found that the dependence of the resistivity on temperature is described byfor most of the compounds, where the 's and 's are empirically determined parameters. The activation energies of conduction are determined by the compounds' lattice constant so long as the dopant concentration is held constant. The activation energies increase as the dopant concentration increases and and coincide at .