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Mixed Protonic–Electronic Conduction in “α‐Al 2 O 3 ”: An Alternative Hypothesis
Author(s) -
Näfe Helfried
Publication year - 2006
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.1551-2916.2005.00699.x
Subject(s) - conductor , ionic bonding , electrolyte , galvanic cell , fast ion conductor , thermal conduction , ionic conductivity , materials science , ion , analytical chemistry (journal) , chemistry , inorganic chemistry , electrode , thermodynamics , physics , organic chemistry , chromatography , composite material
As an alternative, the voltage data of Kurita et al . recently published on galvanic cells with commercial α‐Al 2 O 3 as a solid electrolyte and with O 2 , H 2 O/α‐Al 2 O 3 as well as H 2 , H 2 O/α‐Al 2 O 3 as electrodes can be quantitatively described by assuming that α‐Al 2 O 3 represents a mixed sodium ionic–electronic conductor rather than a protonic–electronic conductor. From the evaluation of the experimental data, numerical values for the p ‐type electronic conduction parameter are obtained that agree sufficiently well with the data known to date for the sodium ion conductor Na‐beta‐Al 2 O 3 .