Oxygen transport of A-site deficient Sr_{1鈭?span style='font-style: italic'>x}Fe_0.5Co_0.5O_{3鈭?span style='font-style: italic'>未} (x = 0-0.3) membranes

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• 作者：Min Jae Shin^a ; ^b ; Ji Haeng Yu^a ; ^b ; ^{jhyu@kier.re.kr}
• 关键词：Mixed conductor ; Oxygen transport membrane ; SrFe0.5Co0.5O3&minus ; 未 ; A-site deficiency
• 刊名：Journal of Membrane Science
• 出版年：2012
• 期刊代码：55_03767388
• 类别：ch
• 出版时间：15 May, 2012
• 卷：401-402
• 期：Complete
• 页码：40-47
• 文件大小：1521 K

摘要

A solid-state reaction was used to prepare Sr_1鈭?em>x(Fe_0.5Co_0.5)O_3鈭?em>未 (x = 0-0.3) mixed (electronic and ionic)-conducting oxides. An A-site cation deficiency in Sr_1鈭?em>x(Fe_0.5Co_0.5)O_3鈭?em>未 (x = 0.05-0.1) causes the Sr-rich phase of grain and grain boundaries to disappear. It also enhances the stability of the perovskite structure and reduces thermal expansion at high temperatures in an Ar atmosphere. However, a further deficiency of Sr causes the segregation of a considerable amount of Co₃O₄ and FeO. As the Sr deficiency is increased, there is a slight decrease in the electrical conductivity in air and improvement of the oxygen permeation fluxes of slightly Sr-deficient membranes (x = 0.05, 0.1). The effect of Sr deficiency on the oxygen transport in the Sr_1鈭?em>x(Fe_0.5Co_0.5)O_3鈭?em>未 membrane is discussed in terms of the microstructure and phase transition.