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High‐Temperature Defect Structure of Iron‐Doped α‐Alumina
Author(s) -
DUTT B. V.,
KRÖGER F. A.
Publication year - 1975
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1975.tb18761.x
Subject(s) - doping , divalent , conductivity , ionic conductivity , ionic bonding , materials science , electrical resistivity and conductivity , ion , chemistry , inorganic chemistry , analytical chemistry (journal) , metallurgy , optoelectronics , physics , organic chemistry , electrode , quantum mechanics , chromatography , electrolyte
Conductivity measurements of iron‐doped a‐Al 2 O 3 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 Al 2 O 3 and for the oxidation‐reduction of divalent to trivalent iron, and to the position of the electronic level of Fe 2+ (=Fe A1′ ) in the gap at E r + 3.66 eV.