期刊
SOLID STATE IONICS
卷 177, 期 19-25, 页码 1737-1742出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2006.03.041
关键词
perovskite-type oxides; membranes; oxygen non-stoichiometry; order-disorder transitions; neutron scattering
High temperature X-ray diffraction (HT-XRD), temperature programmed desorption (TPD), thermogravimetric analysis-differential thermal analysis (TGA/DTA) and neutron diffraction were combined to determine the structure and oxygen stoichiometry of SrCo0.8Fe0.2O3-delta (SCF) and Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) up to 1273 K in the pO(2) range of 1 to 10(-5) atm. Formation of the vacancy-ordered brownmillerite phase, SrCo0.8Fe0.2O2.5, was observed as a region of zero oxygen release in the TPD measurements and confirmed by HT-XRD and TGA/DTA. No ordering was observed in the BSCF system by any of the techniques utilized in this work. The oxygen vacancy concentration of BSCF was found to be considerably higher than that of SCF and always higher than that of the ordered brownmillerite phase of SCF, delta=0.5. The combination of a high vacancy concentration and absence of ordering leads to higher oxygen permeation fluxes through BSCF membranes in comparison to SCE (c) 2006 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据