A novel series of Ba_0.5Sr_0.5Al_{0.2鈭?span style='font-style: italic'>x}Mg_xFe_0.8O_{3鈭?span style='font-style: italic'>尉} (x 鈮?#xa0;0.2) membranes for oxygen permeation application

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• 作者：Shivendra Kumar Jaiswal ; Jitendra Kumar
• 关键词：Ceramics ; Sol&ndash ; gel synthesis ; X-ray diffraction ; Mö ; ssbauer studies ; Polaron conduction
• 刊名：Journal of the European Ceramic Society
• 出版年：February, 2014
• 年：2014
• 卷：34
• 期：2
• 页码：381-390
• 全文大小：2635 K

文摘

The pervoskite-type oxides have received attention due to their potential applications in catalysis, fuel cells, sensors, gas separable membranes, and electrolytes. In view of the importance of oxygen separation from air, stable Ba_0.5Sr_0.5Al_0.2鈭?em>xMg_xFe_0.8O_3鈭?em>尉 (x = 0-0.2) powders have been synthesized by decomposition of sol-gel derived oxalate at 950 掳C for 5 h and characterized with regard to formation, nature of iron species, oxygen permeation, and electrical conductivity. It is shown that magnesium substitution leads to (i) a stable perovskite-type cubic phase with 鈥?em>a鈥?#xA0;= 3.953-3.978 脜, (ii) weakening of metal-oxygen bond, (iii) reduction of Fe⁴⁺ ions, and (iv) enhancement of oxygen deficiency and electrical conductivity. Their compact discs act as stable oxygen permeable filters with flux density of 鈭?.013-3.355 渭mol cm^鈭? s^鈭? at 1000 掳C. The maximum value corresponds to composition x = 0.2 and hence can be a potential membrane for oxygen separation technology.