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000864756 0247_ $$2doi$$a10.1021/acs.chemmater.9b02213
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000864756 1001_ $$0P:(DE-Juel1)171461$$aHe, Guanghu$$b0
000864756 245__ $$aTemperature-Induced Structural Reorganization of W-doped Ba0.5Sr0.5Co0.8Fe0.2O3-δ Composite Membranes for Air Separation
000864756 260__ $$aWashington, DC$$bAmerican Chemical Society$$c2019
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000864756 520__ $$aThe practical use of Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) prototypical oxygen-transport membrane for air separation is currently hampered by the decomposition of the cubic perovskite into a variant with hexagonal stacking at intermediate temperatures of ≤850 °C, which impairs the oxygen transport. Here, we report the development of a W-doped BSCF composite that contains Fe-rich single perovskite (SP) and W-rich double perovskite (DP) phases with different crystallographic parameters. In contrast to BSCF, the BSCFW SP/DP composite maintains its cubic structure at 800 °C for 200 h, demonstrating its structural stability at intermediate temperatures. We use X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy to show that the enhanced phase stability of the composite is associated with a temperature-induced SP–DP dynamic interaction, which involves W and Fe interdiffusion between the SP and DP phases, dynamically adjusting the chemical composition and limiting structural distortion and new phase formation. The composite exhibits a stable permeation performance in the oxygen-transport membrane during over 150 h operation at 800 and 700 °C, confirming the potential of intermediate-temperature oxygen-transport membranes for air separation and providing insight for designing thermally stable composite oxides.
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000864756 7001_ $$0P:(DE-Juel1)173944$$aLan, Qianqian$$b1$$ufzj
000864756 7001_ $$0P:(DE-Juel1)159368$$aSohn, Yoo Jung$$b2$$ufzj
000864756 7001_ $$0P:(DE-Juel1)129587$$aBaumann, Stefan$$b3$$ufzj
000864756 7001_ $$0P:(DE-HGF)0$$aDunin-Borkowski, Prof. Rafal$$b4
000864756 7001_ $$0P:(DE-Juel1)129637$$aMeulenberg, Wilhelm A$$b5$$eCorresponding author$$ufzj
000864756 7001_ $$0P:(DE-HGF)0$$aJiang, Heqing$$b6$$eCorresponding author
000864756 773__ $$0PERI:(DE-600)1500399-1$$a10.1021/acs.chemmater.9b02213$$gp. acs.chemmater.9b02213$$n18$$p7487-7492$$tChemistry of materials$$v31$$x1520-5002$$y2019
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000864756 8564_ $$uhttps://juser.fz-juelich.de/record/864756/files/acs.chemmater.9b02213.pdf$$yPublished on 2019-08-22. Available in OpenAccess from 2020-08-22.
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