ELECTRICAL-PROPERTIES IN THE ZRO2-CEO2-Y2O3 SYSTEM

The ionic and electronic conductivities in ZrO2-CeO2-Y2O3 mixed conduc tors were successfully measured by using the electron blocking method. The observed oxygen partial pressure dependence of the ionic conducti vity was well explained by the behavior of the oxygen vacancies produc ed from the reduction of Ce ions at low oxygen partial pressures. The observed oxygen partial pressure dependence of the electronic conducti vity was well explained by the electron hopping process between Ce3+ a nd Ce4+ ions in the reducing conditions.