Modes of surface exchange in La0.2Sr0.8Cr0.2Fe0.8O3-d

被引：7
|
作者：
Mims, CA [1 ]
Bayani, N
Jacobson, AJ
van der Heide, PAW
机构：
[1] Univ Toronto, Dept Chem Engn & Appl Chem, Toronto, ON M5S 3E5, Canada
[2] Univ Houston, Mat Res Sci & Engn Ctr, Houston, TX 77204 USA
来源：
SOLID STATE IONICS | 2005年 / 176卷 / 3-4期
基金：
加拿大自然科学与工程研究理事会; 美国国家科学基金会;
关键词：
oxygen transport; isotope exchange; SIMS; depth profiling; perovskite; redox;
D O I：
10.1016/j.ssi.2004.08.014
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Surface activation and bulk transport of oxygen in dense samples of La0.2Sr0.8BCr0.2Fe0.8O3-d were studied with Ion Exchange/Depth Profiling (IEDP) techniques. Both high oxygen activity (20% O-18(2)) and low oxygen activity (CO/(CO2)-O-18) conditions were studied at 1023 and 1123 K. Mass spectrometry of the gas phase during the isotope infusion allows the resolution of two pathways for isotope exchange with the solid. Redox exchange, which is significant for the performance of oxygen transport membranes is relatively slow compared with rapid direct isotope exchange between the solid and CO2. The rates of this redox process are somewhat lower than molecular oxygen activation in 20% O-2 at the same temperature and thus could be a kinetically significant factor in steady state operation of oxygen transport membranes. The oxygen bulk mobilities were similar in the two conditions. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码：319 / 323
页数：5
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