Investigation of Zr-doped BSCF perovskite membrane for oxygen separation in the intermediate temperature range

Investigation of Zr-doped BSCF perovskite membrane for oxygen separation in the intermediate temperature range
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Zr掺杂BSCF钙钛矿膜在中温范围内分离氧气的研究

DOI:
10.1016/j.jssc.2013.02.023
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发表时间:
2013
影响因子:
3.3
通讯作者:
Armin Feldhoff
Armin Feldhoff
中科院分区:
化学3区
文献类型:
--
作者:
Olga Ravkina;Tobias Klande;Armin Feldhoff

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The series of (Ba0.5Sr0.5)(Co0.8Fe0.2)1−zZrzO3−δ(z=0, 0.01, 0.03, 0.05, 0.07, and 0.09) was synthesized by a sol–gel method. The materials with a zirconium content up to 3mol% were found to be single phase. Further increase results in formation of a mixed (Ba,Sr)ZrO3by-phase, which was found along the grain boundaries and in the grains. With increasing zirconium content the oxygen permeation flux decreases considerably. The effect of the zirconium substitution on the long-term phase stability was investigated by long-term oxygen permeation experiments and X-ray diffraction. A slight stabilization of the oxygen flux of (Ba0.5Sr0.5)(Co0.8Fe0.2)0.97Zr0.03O3−δwas found after 180h at 1023K. However, all compositions show a decrease in permeation flux with time, but the pure BSCF membrane exhibited the strongest drop after 180h of operation. The decomposition products of the cubic perovskite phase were found to be a hexagonal Ba0.5±xSr0.5±xCoO3and a rhombohedral Ba1−xSrxCo2−yFeyO5−δ.
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