High-temperature electrical transport in Al-doped calcium and strontium titanates |
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| Authors: | L A Dunyushkina V A Gorbunov A A Babkina N O Esina |
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| Institution: | (1) Institute of High Temperature Electrochemistry, Ural Division of Russian Academy of Science, 22 S.Kovalevskoy St., 620219 Ekaterinburg, Russia;(2) Ural State University, 51 Lenin Av., 620083 Ekaterinburg, Russia |
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| Abstract: | The electrical conductivity of perovskite-related oxides CaTi1−xAlxO3−δ and SrTi1−xAlxO3−δ (x=0−0.4) were investigated within the temperature range 900 to 1000 °C and the oxygen partial pressure range between 10−20 and 0.21 atm using a dc four-point technique. The materials investigated show predominantly p-type electronic conductivity
at high, n-type electronic conductivity at low, and ionic conductivity at intermediate oxygen partial pressures. The values
of ionic conductivity in CaTi1−xAlxO3−δ were found to be lower than those in CaTi1−xFexO3−δ. The effect of aluminium concentration on the high-temperature transport properties was examined.
Paper presented at the 9th EuroConference on Ionics, Ixia, Rhodes, Greece, Sept. 15 – 21, 2002. |
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