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Influence of the size of doping ion on phase stability and oxygen permeability of SrCo0.8Fe0.2O3−δ oxide
Authors:Liang Tan  Li Yang  Xuehong Gu  Wanqin Jin  Lixiong Zhang  Nanping Xu  
Institution:

Membrane Science and Technology Research Center, Nanjing University of Technology, Nanjing 210009, PR China

Abstract:The compounds of SrCo0.8Fe0.2O3−δ (SCF) doped with Mg2+, Ca2+, Sr2+, Ba2+, Ti4+ and Zr4+ are synthesized by conventional solid-state reaction. The phase stabilities and oxygen permeabilites of these synthesized oxides are investigated. It is found that the doping Mg2+, Ca2+, Sr2+ and Ba2+ totally dissolve into the SCF unit cell, while SrTiO3 and SrZrO3 phases form when SCF is doped with Ti4+ and Zr4+, respectively. A possible mechanism of the doping behavior is proposed to interpret the structure transformation of the SCF unit cell. Phase stability increases directly with the size of the doping ion when SCF is doped with the ions in the same group. However, the influence of the size of the doping ion on the oxygen permeation behavior is negligible for the membranes doped with the ions in the same group.
Keywords:Size  Doping ion  Phase stability  Oxygen permeability  Perovskite oxides
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