Abstract
The electrical conductivity of CaTi1−x Fe x O3-δ (x = 0.1) was measured by an alternating current van der Pauw technique versus oxygen partial pressure (10−30-1 atm) and temperature (450–1200°C). The results were interpreted to reflect n-type, ionic and p-type conductivity at respectively low, intermediate and high oxygen partial pressures. The apparent activation enthalpy for the ionic conductivity, interpreted to reflect the mobility of oxygen vacancies, was 0.87 eV. The enthalpy of intrinsic formation of electronic defects (apparent band gap E g) was 3eV. The results are compared with literature data for CaTi0.8Fe0.2O3-δ and with Fe-substituted SrTiO3 and discussed in terms of iron-oxygen vacancy association and ordering.
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