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Oxygen Permeability of Strontium-Doped LaCoO3-δ Perovskites

Published online by Cambridge University Press:  16 February 2011

RenÉ H. E. Van Doorn ,
H. Kruidhof ,
H.J.M. Bouwmeester  and
A.J. Burggraaf
RenÉ H. E. Van Doorn
Affiliation:
University of Twente, Fac. of Chemical Technology Department of Inorganic Chemistry and Material Science, P.O.Box 217, NL-7500 AE Enschede, The Netherlands
H. Kruidhof
Affiliation:
University of Twente, Fac. of Chemical Technology Department of Inorganic Chemistry and Material Science, P.O.Box 217, NL-7500 AE Enschede, The Netherlands
H.J.M. Bouwmeester
Affiliation:
University of Twente, Fac. of Chemical Technology Department of Inorganic Chemistry and Material Science, P.O.Box 217, NL-7500 AE Enschede, The Netherlands
A.J. Burggraaf
Affiliation:
University of Twente, Fac. of Chemical Technology Department of Inorganic Chemistry and Material Science, P.O.Box 217, NL-7500 AE Enschede, The Netherlands
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Abstract

Oxygen permeation rates are reported for 2 mm thick La1-xSrxCoO3-δ (0 ≤x≤0.8) in the temperature range 700 ≤T 1100 °C and oxygen partial pressure range 7.0 x 103 - 1.0 x 105 Pa. With the exception of x = 0.6 permeation rates increase with an increase in Sr doping level. The oxygen permeation can be described by Wagner theory. An anomaly is observed in the oxygen permeation between 750 - 775 °C, which is attributed to an order-disorder transition. It is further shown that the partial pressure at the low partial pressure side of the membrane has an important influence on the permeation rate. The (calculated) ionic conductivities and oxygen vacancy diffusion coefficients are among the highest reported in literature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 369: Symposium U – Solid State Ionics IV , 1994 , 377
Copyright
Copyright © Materials Research Society 1995

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