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000844396 1001_ $$0P:(DE-HGF)0$$aUnger, Lana-Simone$$b0$$eCorresponding author
000844396 245__ $$aYttrium doping of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ part I: Influence on oxygen permeation, electrical properties, reductive stability, and lattice parameters
000844396 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2018
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000844396 520__ $$aBa0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) exhibits a very high oxygen permeability in its cubic perovskite phase, making it a promising candidate for high-temperature energy-related applications such as oxygen-transport membranes. It suffers, however, from a pronounced phase instability at application-relevant temperatures below 840 °C which is presumed to result from a valence change of B-site cobalt. In an attempt to stabilize the cubic BSCF phase, monovalent Y3+ was doped in small concentrations (1–10 mol-% yttrium) onto its B-site. The influence of this doping on the physico-chemical properties (electrical conductivity, reductive stability, lattice constant), on the sintering behavior, and on the oxygen permeation of BSCF has been systematically investigated. Despite a slightly adverse effect to permeability (decrease in oxygen permeation by about 20–30%), a doping concentration of 10 mol-% Y is found to completely suppress secondary-phase formation and, hence, stabilize the cubic BSCF system at 800 °C. These findings are extremely promising with regard to a long-term operation of BSCF in atmospheres free of acidic impurity gases.
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000844396 7001_ $$0P:(DE-HGF)0$$aNiedrig, Christian$$b1
000844396 7001_ $$0P:(DE-HGF)0$$aWagner, Stefan F.$$b2
000844396 7001_ $$0P:(DE-HGF)0$$aMenesklou, Wolfgang$$b3
000844396 7001_ $$0P:(DE-Juel1)129587$$aBaumann, Stefan$$b4$$ufzj
000844396 7001_ $$0P:(DE-Juel1)129637$$aMeulenberg, Wilhelm A.$$b5$$ufzj
000844396 7001_ $$0P:(DE-HGF)0$$aIvers-Tiffée, Ellen$$b6
000844396 773__ $$0PERI:(DE-600)2013983-4$$a10.1016/j.jeurceramsoc.2017.12.045$$gVol. 38, no. 5, p. 2378 - 2387$$n5$$p2378 - 2387$$tJournal of the European Ceramic Society$$v38$$x0955-2219$$y2018
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