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Sintering process optimization for multi-layer CGO membranes by in situ techniques

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Authors:
  • Kaiser, Andreas ;
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    Orcid logo0000-0001-9873-3015
    Department of Energy Conversion and Storage, Technical University of Denmark
  • Prasad, A.S. ;
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    Banaras Hindu University
  • Foghmoes, Søren Preben Vagn ;
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    Orcid logo0000-0002-9166-2039
    Department of Energy Conversion and Storage, Technical University of Denmark
  • Ramousse, Severine ;
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    Orcid logo0000-0003-0780-1858
    Department of Energy Conversion and Storage, Technical University of Denmark
  • Bonanos, Nikolaos ;
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    Orcid logo0000-0002-6252-4681
    Department of Energy Conversion and Storage, Technical University of Denmark
  • Esposito, Vincenzo
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    Orcid logo0000-0002-9817-7810
    Ceramic Engineering & Science, Department of Energy Conversion and Storage, Technical University of Denmark
DOI:
10.1016/j.jeurceramsoc.2012.09.021
Abstract:
The sintering of asymmetric CGO bi-layers (thin dense membrane on a porous support; Ce0.9Gd0.1O1.95-delta = CGO) with Co3O4 as sintering additive has been optimized by combination of two in situ techniques. Optical dilatometry revealed that bi-layer shape and microstructure are dramatically changing in a narrow temperature range of less than 100 degrees C. Below 1030 degrees C, a higher densification rate in the dense membrane layer than in the porous support leads to concave shape, whereas the densification rate of the support is dominant above 1030 degrees C, leading to convex shape. A fiat bi-layer could be prepared at 1030 degrees C, when shrinkage rates were similar. In situ van der Pauw measurements on tape cast layers during sintering allowed following the conductivity during sintering. A strong increase in conductivity and in activation energy E-a for conduction was observed between 900 and 1030 degrees C indicating an activation of the reactive sintering process and phase transformation of cobalt oxide. (C) 2012 Elsevier Ltd. All rights reserved.
Type:
Journal article
Language:
English
Published in:
Journal of the European Ceramic Society, 2013, Vol 33, Issue 3, p. 549-556
Keywords:
Doped ceria; Multi-layer sintering; Sintering aid; Optical dilatometry; van der Pauw
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2013
Scientific Level:
Scientific
ID:
233103095

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