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Yttrium doped BSCF membranes for oxygen separation

机译:钇掺杂的BSCF膜用于氧气分离

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This work investigates the partial substitution of yttrium in place of iron in BSCF to form Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2-x)Y_xO_(3-δ), where x varied between 0 and 0.2. X-ray diffraction patterns showed the formation of a perovskite cubic phase structure up to x = 0.15, whilst the full substitution of yttrium (x = 0.2) for iron resulted in a non-cubic crystal structure that did not exhibit oxygen permeation. The yttrium partial substitution in BSCFY discs (1.2 mm thick) delivered best results for x = 0.025, as oxygen fluxes reached 2.05 ml cm~(-2) min~(-1) at 900 °C, an increase of 160% as compared to a blank BSCF (x = 0) membrane. This was attributed to the combined effect of the formation of a greater number of oxygen vacancies, together with improved ion mobility, associated with the beneficial yttrium substitution into the BSCF perovskite structure which stemmed from the crystal lattice expansion.
机译:这项工作研究了在BSCF中用钇代替铁的部分取代形成Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2-x)Y_xO_(3-δ),其中x在0到0.2之间变化的现象。 X射线衍射图表明,钙钛矿立方相结构的形成高达x = 0.15,而钇(x = 0.2)完全替代铁导致了非立方晶体结构,该结构没有氧渗透。 BSCFY圆片(1.2毫米厚)中的钇部分替代在x = 0.025时表现出最佳结果,因为在900°C时氧气通量达到2.05 ml cm〜(-2)min〜(-1),与上一年度相比增加了160%到空白的BSCF(x = 0)膜上。这归因于形成更多的氧空位以及改善的离子迁移率的联合作用,该迁移率与有益的钇置换成源于晶格膨胀的BSCF钙钛矿结构有关。

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