Electronic Conductivity, Seebeck Coefficient, and Defect Structure of La1-xSrxFeO3 (x=0.l, 0.25)

The electrical conductivity and Seebeck coefficients of La1‐xSrxFeO3 (x=0.1, 0.25) were measured as a function of oxygen partial pressure, PO2, at T=900° to 1300°C. The electrical conduction was p type in the higher PO2 range, and n type in the lower PO2 range. The Seebeck coefficient indicated that the conduction was due to electron hopping between Fe×Fe and FeFe, in the higher PO2 range and electron hopping between Fe′Fe and Fe×Fe in the lower range. The carrier concentrations were calculated from the values of electrical conductivity and Seebeck coefficient. From the PO2 dependences of the carrier concentrations, the defect structure of La1‐xSrxFeO3 was determined. It was found that the electrical properties can be described by considering the imperfections SrLa, Vo, FeFe, and Fe′Fe.