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| Electronic-ionic Impedance Characteristics of (Y0.08Sr0.92)1-xTi0.6Fe0.4O3-δ Mixed Conductor |
Ke SHAN1,**( ),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 |
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Cite this article:
Ke SHAN,Xingmin GUO. Electronic-ionic Impedance Characteristics of (Y0.08Sr0.92)1-xTi0.6Fe0.4O3-δ Mixed Conductor. Chinese Journal of Materials Research, 2015, 29(6): 429-433.
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Abstract A single phase A-site-deficient perovskite (Y0.08Sr0.92)1-xTi0.6Fe0.4O3-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 (Y0.08Sr0.92)1-xTi0.6Fe0.4O3-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 (Y0.08Sr0.92)1-xTi0.6Fe0.4O3-δ (x=0.05, 0.07, 0.10) varies from 0.11 Scm-1 to 0.26 Scm-1 at 800oC. 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.
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Received: 13 November 2014
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| Fund: *Supported by National Natural Science Foundation of China No. 51374017. |
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