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 in | Solid state ionics Vol. 116; no. 1; pp. 85 - 88 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
1999
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Subjects | |
Online Access | Get full text |
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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. |
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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 |