Journal Article

PreJuSER-17253

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Influence of Thermal History on the Cubic-To-Hexagonal Phase Transformation and Creep Behaviour of Ba0.5Sr0.5Co0.8Fe0.2O3 Ceramics

Rutkowski, B.FZJ* ; Malzbender, J.FZJ* ; Steinbrech, R. W.FZJ* ; Beck, T.FZJ* ; Bouwmeester, H. J. M.

2011
Elsevier New York, NY [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.memsci.2011.07.036

Abstract: The influence of the partial cubic-to-hexagonal phase transformation of Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) on the creep behaviour of this perovskite-type oxygen transport membrane was investigated. Isothermal compressive creep tests were carried out in air in the temperature range 750-950 degrees C. Arrhenius plots of the creep rate revealed a significant hysteresis effect. During heating, the creep rate changed slightly up to about 850 degrees C and increased substantially above this temperature. Upon cooling from 950 degrees C it decreased in a nearly linear manner to temperature. Microstructural investigations support the conclusion that the hysteresis is linked with the growth and transformation kinetics of the hexagonal polymorph at the boundaries of cubic grains of BSCF. (C) 2011 Elsevier B.V. All rights reserved.

Keyword(s): J ; Oxygen separation (auto) ; Ceramic membranes (auto) ; Creep (auto) ; Stability (auto) ; Phase transformation (auto)

Note: The authors would like to express their gratitude to T. Osipova, J. Monch and R. Kuppers for the experimental support for the creep tests and Dr. R. Kriegel, IKTS-HITK for providing the BSCF specimens. This work was supported by the Initiative and Networking Fund of the Helmholtz Association, contract HA-104 ("MEM-BRAIN").

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Contributing Institute(s):

1. Werkstoffstruktur und -eigenschaften (IEK-2)
2. Werkstoffsynthese und Herstellverfahren (IEK-1)

Research Program(s):

1. Rationelle Energieumwandlung (P12)

Appears in the scientific report 2011

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