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Ionic Transference Numbers and Electrical Conduction in MgAl 2 O 4 Spinel
Author(s) -
SONDER EDWARD
Publication year - 1983
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.1151-2916.1983.tb09967.x
Subject(s) - ionic conductivity , ionic bonding , spinel , partial pressure , oxygen , impurity , analytical chemistry (journal) , thermal conduction , electrical resistivity and conductivity , atmospheric temperature range , chemistry , oxygen pressure , inorganic chemistry , mineralogy , conductivity , materials science , ion , thermodynamics , electrode , metallurgy , electrolyte , environmental chemistry , physics , organic chemistry , electrical engineering , composite material , engineering
Ionic transference numbers were obtained for T =1000 to 1700 K and for oxygen pressures 10 5 to 10 −11 Pa by measuring potentials produced across samples having different oxygen partial pressures at the two faces. Alternating and direct current conductivities were also measured for the same samples over the same range of temperature and pressure. The results show that conduction in MgAl 2 O 4 is almost purely ionic and that the conductivity is not greatly influenced by either ambient oxygen pressure or iron impurity up to 0.1%. It is proposed that the current carriers are cation vacancies that are present as a result of cation nonstoichiometry.