Abstract
The crystal structure and electrical conductivity of Ba2(Fe1−xInx)2O5 were studied. It was found that Ba2(Fe1−xInx)2O5 has the cubic perovskite structure with disordered oxygen vacancies at room temperature. The variation of the molar volume with the In3+ content obeyed Vegard's law, indicating that In3+ was successfully substituted into Fe3+ sites at random. Thermogravimetry–differential thermal analysis revealed that Ba2(Fe1−xInx)2O5 (x ≠ 0, 1) does not undergo structural phase transitions between room temperature and 1200 °C under a N2 flow. The electrical conductivity was measured by the four-probe method under a N2 flow. Although the types of conductivity were not clearly determined, the conductivity for x = 0.1 exhibited the maximum value of more than 10−1 S/cm above 600 °C.
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