Mixed oxide ion and electronic conductivity in perovskite-type SrSnO 3 by Fe substitution

Abstract

The electrical conductivity properties of Fe-substituted SrSnO 3 perovskite-type oxides as a function of temperature and oxygen partial pressure are presented. SrSn 1− x Fe x O 3− δ (0≤ x≤1) was prepared by conventional solid state reaction in air using SrCO 3, SnO 2 and FeC 2O 4 · 2H 2O. The total electrical conductivity increases with increasing Fe content. Compounds containing low Fe contents ( x<0.5) are mixed oxide ion and electronic conductors in the oxygen partial pressure range between 10 −23 and 0.21 atm with predominant n-type and p-type electronic conduction at low and high oxygen partial pressure, respectively. SrSn 1− x Fe x O 3− δ with high Fe-content ( x>0.5) is found to be a predominant electronic conductor over the entire oxygen partial pressure regime (10 −23–0.21 atm). The average oxide ion transference number is found to be in the range 0.1–0.5 at 600–850 °C for x=0.1–0.2.