(Y0.08Sr0.92)1-xTi0.6Fe0.4O3-δ混合导体材料的电子-离子阻抗特性*

doi:10.11901/1005.3093.2014.674

材料研究学报

2015, Vol. 29

Issue (6): 429-433 DOI: 10.11901/1005.3093.2014.674

本期目录 | 过刊浏览

(Y_0.08Sr_0.92)_1-_xTi_0.6Fe_0.4O_3-_δ混合导体材料的电子-离子阻抗特性^*

单科¹(

),郭兴敏²

1. 红河学院理学院新能源材料重点实验室蒙自 6611992.
2.北京科技大学钢铁冶金新技术国家重点实验室北京 100083

Electronic-ionic Impedance Characteristics of (Y_0.08Sr_0.92)_1-_xTi_0.6Fe_0.4O_3-_δ Mixed Conductor

Ke SHAN^1,^**(

),Xingmin GUO²

1. Laboratory of New Materials for Power Sources, College of Science, Honghe University, Mengzi 661199, China
2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing,Beijing 100083, China

引用本文:

单科,郭兴敏. (Y_0.08Sr_0.92)_1-_xTi_0.6Fe_0.4O_3-_δ混合导体材料的电子-离子阻抗特性^*[J]. 材料研究学报, 2015, 29(6): 429-433.
Ke SHAN, Xingmin GUO. Electronic-ionic Impedance Characteristics of (Y_0.08Sr_0.92)_1-_xTi_0.6Fe_0.4O_3-_δ Mixed Conductor[J]. Chinese Journal of Materials Research, 2015, 29(6): 429-433.

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摘要:

用溶胶-凝胶法制备了(Y_0.08Sr_0.92)_1-_xTi_0.6Fe_0.4O_3-_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(Y_0.08Sr_0.92)_1-_xTi_0.6Fe_0.4O_3-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(Y_0.08Sr_0.92)_1-_xTi_0.6Fe_0.4O_3-_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。(Y_0.08Sr_0.92)_1-_xTi_0.6Fe_0.4O_3-_δ(x = 0.05, 0.07, 0.10)在800℃的总电导率为0.011-0.26 Scm^-1。(Y_0.08Sr₀_.92)_1-_xTi_0.6Fe_0.4O_3-_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。

关键词 ：无机非金属材料, (Y_0.08Sr_0.92)_1-_xTi_0.6Fe_0.4O_3-_δ, , 电子阻抗, 离子阻抗, 弛豫

Abstract：

A single phase A-site-deficient perovskite (Y_0.08Sr_0.92)_1-_xTi_0.6Fe_0.4O_3-_δ (x=0.05, 0.07, 0.10) was synthesized at 1350 ^oC in air by sol-gel method. The effect of A-site deficiency in (Y_0.08Sr_0.92)_1-_xTi_0.6Fe_0.4O_3-_δ on its phase structure, electrical and ionic conductivity and impedance was investigated. The partial oxygen ionic conductivity decreases with the increasing A-site deficiency, which may be attributed to the tendency for oxygen vacancy ordering. The n-type electronic conductivity in air increases with the increasing A-site deficiency, which may be attributed to the decrease of and due to the possible ionization reaction of ferric iron. The total electrical conductivity of (Y_0.08Sr_0.92)_1-_xTi_0.6Fe_0.4O_3-_δ (x=0.05, 0.07, 0.10) varies from 0.11 Scm^-1 to 0.26 Scm^-1 at 800^oC. Only one oblique line in high frequency range for each temperature is presented, demonstrating that the electronic conductivity should mainly contribute to the total electrical conductivity. The increase of A-site deficiency is unfavorable for ion conductivity due to a subsequently rising relaxation time.

Key words： inorganic non-metallic materials, (Y_0.08Sr_0.92)_1-_xTi_0.6Fe_0.4O_3-_δ , electrical impedance, ionic impedance, relaxation

收稿日期: 2014-11-13

基金资助:^*国家自然科学基金51374017资助项目。

作者简介: 单科

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.674 或 https://www.cjmr.org/CN/Y2015/V29/I6/429

图1 (Y0.08Sr0.92)1-xTi0.6Fe0.4O3-δ在1350℃烧结5 h的XRD图谱

图2 (Y0.08Sr0.92)1-xTi0.6Fe0.4O3-δ (x= 0.05, 0.07, 0.10)容差因子随x值变化曲线

图3 (Y0.08Sr0.92)1-xTi0.6Fe0.4O3-δ在1350℃烧结5 h后的断面扫描电镜照片

图4 (Y0.08Sr0.92)1-xTi0.6Fe0.4O3-δ复阻抗谱图

图5 (Y0.08Sr0.92)1-xTi0.6Fe0.4O3-δ总电导率随温度变化曲线

图6 (Y0.08Sr0.92)0.90Ti0.6Fe0.4O3-δ在不同温度下离子传导的复阻抗谱图

图7 Y0.08Sr0.92Ti1-xFexO3-δ(a) x= 0.05, (b) x= 0.07 与 (c) x=0.10频率的关系

表1 Y0.08Sr0.92Ti1-xFexO3-δ的fmax和

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