Crystal Physics and Electro-Ceramics Laboratory, Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Abstract:
The results of electrical conductivity measurements on SrCe0.95Yb0.05O3 under controlled oxygen partial pressure and temperature are presented. A defect model consistent with experimental results is proposed which provides for PO2−1/4 dependent n-type, Po2-independent oxygen ion and PO2+1/4 dependent p-type conductivity components. The band gap, reduction, oxidation and ion-migration energies are determined from an analysis of the data in terms of the proposed defect model. These results suggest that some earlier data interpreted in terms of protonic conduction may require re-evaluation.