Electronic and ionic conductivities and point defects in ytterbium sesquioxide at high temperature

Abstract

From the study of complex impedance diagrams applied to a symmetric cell Pt-Yb2O3-Pt, the authors have shown the mixed character of electrical conduction within the ytterbium sesquioxide. The measurements were performed at thermodynamic equilibrium in the temperature range from 1423 to 1623 K and the partial pressure of oxygen range from 10-12 to 1 atm. The variations of ionic and electronic conductivity as a function of PO2, were interpreted in terms of point defects e′, ḣ, V‴Yb and YbI {combining triple dot above}, in the general case of a Frenkel disorder. The relative contributions and the activation energies of conduction of these different defects were determined. © 1982.