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Oxygen Permeation Properties and Phase Stability of Co-Free $La_{0.6}Sr_{0.4}Ti_{0.2}Fe_{0.8}O_{3-{\delta}}$ Oxygen Membrane  

Kim, Ki-Young (Energy Conversion Research Department, Korea Institute of Energy Research)
Park, Jung-Hoon (Energy Conversion Research Department, Korea Institute of Energy Research)
Kim, Jong-Pyo (Energy Conversion Research Department, Korea Institute of Energy Research)
Son, Sou-Hwan (Energy Conversion Research Department, Korea Institute of Energy Research)
Park, Sang-Do (Carbon Dioxide Reduction and Sequestration R&D Center, Korea Institute of Energy Research)
Publication Information
Korean Membrane Journal / v.9, no.1, 2007 , pp. 34-42 More about this Journal
Abstract
A perovskite-type ($La_{0.6}Sr_{0.4}Ti_{0.2}Fe_{0.8}O_{3-{\delta}}$) dense ceramic membrane was prepared by polymerized complex method, using citric acid as a chelating agent and ethylene glycol as an organic stabilizer. Effect of Ti addition on lanthanum-strontium ferrite mixed conductor was investigated by evaluating the thermal expansion coefficient, the oxygen flux, the electrical conductivity, and the phase stability. The thermal expansion coefficient in air was $21.19\;{\times}\;10^{-6}/K$ at 473 to 1,223 K. At the oxygen partial pressure of 0.21 atm ($20%\;O_2$), the electrical conductivity increased with temperature and then decreased after 973 K. The decrement in electrical conductivity at high temperatures was explained by a loss of the lattice oxygen. The oxygen flux increased with temperature and was $0.17\;mL/cm^2{\cdot}min$ at 1,223 K. From the temperature-dependent oxygen flux data, the activation energy of oxygen ion conduction was calculated and was 80.5 kJ/mol at 1,073 to 1,223 K. Also, the Ti-added lanthanum-strontium ferrite mixed conductor was structurally and chemically stable after 450 hours long-term test at 1,173 K.
Keywords
ceramic dense membrane; perovskite type structure; oxygen permeation; ionic conductivity; activation energy; phase stability;
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Times Cited By KSCI : 1  (Citation Analysis)
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