Abstract
The electronic conductivity of sintered BSCF ceramics (Ba0.5Sr0.5Co x Fe1−x O3−δ, 0 ≤ x ≤ 1) was measured as a function of temperature up to 1273 K in air. The conductivity of BSC is thermally activated over 298–1273 K with an activation energy of 0.21 eV. The conductivity of BSF and BSCF (0.2 ≤ x ≤ 0.8) is thermally activated below ∼673 K with activation energies of 0.21 eV–0.40 eV. Above 673 K, the formation of oxygen vacancies results in a decrease in p-type carrier concentration and a decrease in electronic conductivity. Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF5582) was also measured under 10−5 atm ≤ pO2 ≤ 1 atm. Below ∼673 K, the electronic conductivity of BSCF 5582 shows no dependence on pO2. Above 673 K, the conductivity of BSCF5582 increases with increasing pO2 for pO2 ≥ 0.01 (p-type conduction) and decreases slightly with increasing pO2 for pO2 ≤ 0.01 atm. The activation energy for conduction above ∼673 K and at pO2 ≥ 0.1 is ∼0.07 eV. Above ∼823K and at pO2 ≥ 0.01 atm, the activation energy for conduction is ∼0.2 eV.
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Acknowledgements
This work was supported by the New York State Foundation for Science, Technology and Innovation, NYSTAR, under contract C030093. XRF analysis of the BSCF samples was kindly provided by Dr. Joon-Hyung Lee in Kyungpook National University, South Korea.
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Jung, JI., Misture, S.T. & Edwards, D.D. The electronic conductivity of Ba0.5Sr0.5Co x Fe1−x O3−δ (BSCF: x = 0 ∼ 1.0) under different oxygen partial pressures. J Electroceram 24, 261–269 (2010). https://doi.org/10.1007/s10832-009-9567-x
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DOI: https://doi.org/10.1007/s10832-009-9567-x