High‐Temperature Defect Structure of Iron‐Doped α‐Alumina

Abstract

Conductivity measurements of iron‐doped a‐Al2O3 by Pappis and Kingery are interpreted on the basis of a model in which ionic defects are the major defect species. The analysis leads to equilibrium constants for the establishment of non‐stoichiornetry in Al2O3 and for the oxidation‐reduction of divalent to trivalent iron, and to the position of the electronic level of Fe2+ (=FeA1′) in the gap at Er+ 3.66 eV.