Ce3+ concentration in ZrO2-CeO2-Y2O3 system studied by electronic Raman scattering

Ceria doped yttria stabilized zirconia (ZrO2-CeO2-Y2O3 system) shows electr on-ion mixed conduction at high temperatures under a reduced atmosphere. In this system, the electronic conductivity is caused by electrons, which may diffuse by hopping conduction between Ce4+ and Ce3+. We applied the electr onic Raman scattering technique on the system in older to measure the conce ntration of Ce3+ in samples. For the X = 0.6 and 0.8 samples in [(ZrO2)(t-X ) (CeO2)(X)](0.9)(Y2O3)(0.1), the oxygen partial pressure dependence of the electronic Raman intensities agrees well with that of the oxygen non-stoic hiometry measured by thermogravimetry. From this result. it is confirmed th at all of the introduced electrons at reduced condition are trapped at ceri um centers in these materials. (C) 2000 Elsevier Science B.V. All rights re served.