期刊
JOURNAL OF MEMBRANE SCIENCE
卷 387, 期 -, 页码 17-23出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2011.08.053
关键词
Mixed conductor; Perovskite; Oxygen separation; Oxidation state; X-ray absorption
资金
- Federal Ministry of Economics and Technology, Germany [0327803B]
The influence of cation substitution on the transition metal oxidation states, oxygen nonstoichiometry and oxygen transport properties of Ba(Co, Fe, Nb)O3-delta perovskites was investigated with room temperature XRD. X-ray absorption near edge structure and high temperature oxygen permeation measurements. Results show that substitution of Fe for Co is accompanied by a decrease in the lattice constant, whereas Nb substitution leads to the opposite trend. With increasing Fe and/or Nb content, the oxygen permeation flux decreases, whereas the apparent activation energy of the oxygen permeation increases. The oxidation state of Co is smaller than +3 and susceptible to the variation of cation composition. In contrast, the oxidation states of Fe and Nb are larger than +3 and close to +5, respectively, and almost independent of the composition. The influence of Fe and Nb contents on the oxygen transport properties is discussed in terms of the oxygen stoichiometry and metal-oxygen bonding. (C) 2011 Elsevier B.V. All rights reserved.
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