Abstract
The electrical properties of bulk and grain boundaries of CexY0.2-xSc0.6Zr3.2O8-d (0 < x < 0.2) have been investigated as a function of temperature and oxygen partial pressure by application of impedance spectroscopy. All samples have been prepared by means of a sol-gel combustion process. The ionic conductivities of the bulk are in the range from 0.03 to 0.04 S cm-1 at 700{degree sign}C in air. In the case of ceria-doped samples a significant decrease of the ionic conductivities of both bulk and grain boundary regions is observed under reducing conditions [p(O2) < 1E-15 bar, 700{degree sign}C] which may be interpreted in terms of association or clustering of oxygen vacancies. In addition, ageing studies have been performed on scandia-stabilized zirconia, doped with 10 mol% Sc2O3 and 1.0 mol% CeO2, in reducing atmosphere (1%-H2/Ar) at 700{degree sign}C by application of a dc four-point technique according to van der Pauw and ac measurements.
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