Volume 97, Issue 8 p. 2654-2661
Original Article

Chemical Expansion Due to Hydration of Proton-Conducting Perovskite Oxide Ceramics

Annika K. E. Andersson

Annika K. E. Andersson

Department of Materials Science and Engineering, Norwegian University of Science and Technology, Trondheim NO-7491, Norway

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Sverre M. Selbach

Sverre M. Selbach

Department of Materials Science and Engineering, Norwegian University of Science and Technology, Trondheim NO-7491, Norway

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Christopher S. Knee

Christopher S. Knee

Department of Chemical and Biological Engineering, Chalmers University of Technology, Göteborg, SE-412 96 Sweden

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Tor Grande

Corresponding Author

Tor Grande

Department of Materials Science and Engineering, Norwegian University of Science and Technology, Trondheim NO-7491, Norway

Author to whom correspondence should be addressed. e-mail: [email protected]Search for more papers by this author
First published: 30 May 2014
Citations: 87

Abstract

The crystal structures of proton-conducting BaZr1−xYxO3−x/2 (BZY05–BZY20) and BaCe0.8Y0.2O2.9 (BCY20) during hydration/dehydration has been studied by in situ high-temperature X-ray diffraction and thermal analysis. A contraction/expansion of the crystal lattice associated with dehydration/hydration was observed for all materials at elevated temperatures and the polymorphic phase transition temperatures of BaCe0.8Y0.2O2.9 were depressed by lowering the vapor pressure of water. A thermodynamic formalism is introduced to describe the chemical expansion associated with the hydration of oxygen vacancies in acceptor-doped oxides. A conventional point defect model was applied to describe the lattice strain associated with the hydration. The chemical expansion is discussed with respect to the available volumetric data on the hydration of proton-conducting oxide materials and its likely impact on ceramic fuel cells/hydrogen separation membranes utilizing a proton-conducting electrolyte.