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Chemical expansion due to hydration of proton conducting perovskite oxide ceramics

Andersson, Annika KE; Selbach, Sverre Magnus; Knee, CS; Grande, Tor
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/284843
Date
2014
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  • Institutt for materialteknologi [1570]
  • Publikasjoner fra CRIStin - NTNU [19849]
Original version
Journal of The American Ceramic Society 2014, 97(8):2654-2661   10.1111/jace.12990
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 vapour 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

utilising a proton conducting electrolyte.
Publisher
American Ceramic Society
Journal
Journal of The American Ceramic Society

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