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用溶胶-凝胶法制备了(Y0.08Sr0.92)1-xTi0.6Fe0.4O3-δ(x=0.05,0.07,0.10)混合导体材料,用X射线衍射(XRD)分析该材料的物相,用交流阻抗法和电子阻塞电极法分别测定材料的总电导率与离子电导率,研究了A位缺位对(Y0.08Sr0.92)1-xTi0.6Fe0.4O3-δ混合导体材料的结构、电性能及阻抗行为的影响。结果表明,所有试样都具有单一立方相钙钛矿结构;在测试温度范围内(Y0.08Sr0.92)1-xTi0.6Fe0.4O3-δ(x=0.05,0.07,0.10)的总电导率随着温度的升高先增大后减小,表现为小极化子导电机理;随着A位缺位量的增加,总电导率降低。(Y0.08Sr0.92)1-xTi0.6Fe0.4O3-δ(x=0.05,0.07,0.10)在800℃的总电导率为0.011-0.26 S·cm-1。(Y0.08Sr0.92)1-xTi0.6Fe0.4O3-δ的总电导率阻抗谱只显示了高频斜线部分,说明材料主要以电子电导为主;离子传导的弛豫时间逐渐随着A位缺位量的增加而增大,说明A位缺位不利于离子在晶界中的传导。
(Y0.08Sr0.92) 1-xTi0.6Fe0.4O3-δ (x = 0.05,0.07,0.10) mixed conductor was prepared by sol-gel method. The phase of this material was characterized by X-ray diffraction , The total conductivity and ionic conductivity of the material were measured by AC impedance method and electronic blocking electrode method respectively. The structure of (Y0.08Sr0.92) 1-xTi0.6Fe0.4O3-δ mixed conductor with absence of A site , Electrical properties and impedance behavior. The results show that all samples have a single cubic phase perovskite structure; the total conductivity of 1-xTi0.6Fe0.4O3-δ (x = 0.05,0.07,0.10) in the test temperature range (Y0.08Sr0.92) With the increase of temperature, the electrical conductivity increases first and then decreases, showing the conduction mechanism of small polaron. With the increase of A-site vacancy, the total conductivity decreases. (Y0.08Sr0.92) 1-xTi0.6Fe0.4O3-δ (x = 0.05,0.07,0.10) The total electrical conductivity at 800 ℃ is 0.011-0.26 S · cm-1. (Y0.08Sr0.92) 1-xTi0.6Fe0.4O3-δ shows only the high-frequency oblique part of the total conductivity impedance spectrum, indicating that the material mainly electronic conductivity; ion conduction relaxation time gradually with the A The increase of vacancy quantity increases, indicating that absence of A site is not conducive to the conduction of ions in grain boundaries.