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Development and characterization of thin-film perovskite membranes with oxygen permeability.

Published online by Cambridge University Press:  01 February 2011

R. Muydinov ,
M. Popova ,
A. Kaul ,
D. Stiens  and
G. Wahl
R. Muydinov
Affiliation:
Department of Chemistry, Moscow State University, 119992, Russia
M. Popova
Affiliation:
Department of Chemistry, Moscow State University, 119992, Russia
A. Kaul
Affiliation:
Department of Chemistry, Moscow State University, 119992, Russia
D. Stiens
Affiliation:
Institute of Surface Technology, TU Braunschweig, D-38108, Germany
G. Wahl
Affiliation:
Institute of Surface Technology, TU Braunschweig, D-38108, Germany
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Abstract

Two conceptions of oxygen selective membrane's development, ceramic and thin film ones were considered using perovskite Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) with mixed oxygen ionic and electronic conductivity. The films of BSCF (2–3mkm thick) were deposited by a MOCVD technique on the porous substrates (YSZ, Al2O3). Gas tightness, selective oxygen flux at 750–950°C and stability of the asymmetric film membranes in working conditions were investigated in comparison with ceramic ones. Sufficiently gas tight films can be directly obtained only on the substrates with submicron pores and at Tdep < 600°C. New alternative approach of large-pore substrates modification for obtaining gas-tight oxygen selectively permeable membranes was developed. To avoid the chemical interaction between BSCF and YSZ or Al2O3 the intermediate layer of BaO was pre-deposited. Resulting permeation through asymmetric membranes was thought to be dependent on oxygen exchange surface reaction and gas permeability of the porous supports.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 835: Symposium K – Solid-State Ionics , 2004 , K3.16
Copyright
Copyright © Materials Research Society 2005

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References

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