Electrical conductivity of iron-doped calcium titanate

Both total and partial electronic conductivity of iron-doped calcium titanates, of general formula CaTi 1− x Fe x O 3−δ ( x=0, 0.1,…0.5), were investigated as a function of oxygen partial pressure at high temperatures (900, 1000°C) by means of the four-probe technique and the Hebb–Wagner polarizatio...

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Published inSolid state ionics Vol. 116; no. 1; pp. 85 - 88
Main Authors Dunyushkina, L.A, Demin, A.K, Zhuravlev, B.V
Format Journal Article
LanguageEnglish
Published Elsevier B.V 1999
Subjects
Calcium titanate
Defect equilibrium
Electron conductivity
Ionic conductivity
Electron conductivity
Defect equilibrium
Ca(Ti, Fe)O 3−δ
Ionic conductivity
Calcium titanate
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Summary:Both total and partial electronic conductivity of iron-doped calcium titanates, of general formula CaTi 1− x Fe x O 3−δ ( x=0, 0.1,…0.5), were investigated as a function of oxygen partial pressure at high temperatures (900, 1000°C) by means of the four-probe technique and the Hebb–Wagner polarization method, respectively. The oxygen partial pressure interval extended from 1 to 10 −18 atm. Ti substitution by Fe results in a considerable increase of both ionic and electronic conductivity and in appearance of a wide region of primarily ionic conductivity, independent of the oxygen partial pressure. Of these compositions, the x=0.2 sample has the highest oxygen ion conductivity. A model of defect equilibrium is discussed.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0167-2738
1872-7689
DOI:10.1016/S0167-2738(98)00197-0