Abstract
The electrical conductivity of the system Y 2O 3CeO 2 was measured in the temperature range 500–1100°C and P o2 range 10 –7−10 −1 atm. Possible defect models were suggested on the basis of conductivity data, which were investigated as a function of temperature and of P o2. The observed activation energies were 0.40 eV and 1.79 eV in the low- and high-temperature regions, respectively. The observed conductivity dependences on P o2 were σ ∝ P 1 6 O 2 in the temperature range 500–750°C and σ ∝ P 1 5.3 O 2 at temperatures from 750–1100°C. It is suggested that the system Y 2O 3CeO 2 shows a mixed ionic plus hole conduction due to an O ″ i defect and an electronic hole conduction due to a V ''' Y defect in the low- and high-temperature regions, respectively.
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