Densification and grain growth during sintering of porous Ce0.9Gd0.1O1.95tape cast layers: A comprehensive study on heuristic methods

De Wei Ni; Cristine Grings Schmidt; Francesca Teocoli; Andreas Kaiser; Kjeld Bøhm Andersen; Severine Ramousse; Vincenzo Esposito

doi:10.1016/j.jeurceramsoc.2013.03.025

Densification and grain growth during sintering of porous Ce0.9Gd0.1O1.95tape cast layers: A comprehensive study on heuristic methods

Authors:

Ni, De Wei ;
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Mixed Conductors, Department of Energy Conversion and Storage, Technical University of Denmark
Schmidt, Cristine Grings ;
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Department of Energy Conversion and Storage, Technical University of Denmark
Teocoli, Francesca ;
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0000-0002-8330-1129
Department of Energy Conversion and Storage, Technical University of Denmark
Kaiser, Andreas ;
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0000-0001-9873-3015
Department of Energy Conversion and Storage, Technical University of Denmark
Andersen, Kjeld Bøhm ;
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Department of Energy Conversion and Storage, Technical University of Denmark
Ramousse, Severine ;
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0000-0003-0780-1858
Department of Energy Conversion and Storage, Technical University of Denmark
Esposito, Vincenzo
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0000-0002-9817-7810
Ceramic Engineering & Science, Department of Energy Conversion and Storage, Technical University of Denmark

DOI:

10.1016/j.jeurceramsoc.2013.03.025

Abstract:

The sintering behavior of porous Ce0.9Gd0.1O1.95(CGO10) tape cast layers was systematically investigated to establish fundamental kinetic parameters associated to densification and grain growth. Densification and grain growth were characterized by a set of different methods to determine the dominant sintering mechanisms and kinetics, both in isothermal and at constant heating rate (iso-rate) conditions. Densification of porous CGO10 tape is thermally activated with typical activation energy which was estimated around 440–470 kJ mol−1. Grain growth showed similar thermal activation energy of ∼427 ± 22 kJ mol−1in the temperature range of 1100–1250ºC. Grain-boundary diffusion was identified to be the dominant mechanism in porous CGO10 tapes. Grain growth and densification mechanism were found strictly related in the investigated temperature range. Porosity acts as a grain growth inhibitor and grain boundary mobility in the porous body was estimated around 10−18–10−16m3N−1s−1 at the investigated temperature range.© 2013 Elsevier Ltd. All rights reserved.

Type:

Journal article

Language:

English

Published in:

Journal of the European Ceramic Society, 2013, Vol 33, Issue 13-14, p. 2529-2537

Keywords:

Sintering; Grain growth; CeO2; Porosity; Grain boundary

Main Research Area:

Science/technology

Publication Status:

Published

Review type:

Peer Review

Submission year:

2013

Scientific Level:

Scientific

ID:

242800003

Densification and grain growth during sintering of porous Ce<sub>0.9</sub>Gd<sub>0.1</sub>O<sub>1.95</sub>tape cast layers: A comprehensive study on heuristic methods

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