کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7898431 1510136 2018 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Yttrium doping of Ba0.5Sr0.5Co0.8Fe0.2O3-δ part I: Influence on oxygen permeation, electrical properties, reductive stability, and lattice parameters
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Yttrium doping of Ba0.5Sr0.5Co0.8Fe0.2O3-δ part I: Influence on oxygen permeation, electrical properties, reductive stability, and lattice parameters
چکیده انگلیسی
Ba0.5Sr0.5Co0.8Fe0.2O3-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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 38, Issue 5, May 2018, Pages 2378-2387
نویسندگان
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