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Water Uptake and Conduction in Strontium Ytterbium Cerate

Published online by Cambridge University Press:  16 February 2011

G. W. Coffey ,
L. R. Pederson  and
W. J. Weber
G. W. Coffey
Affiliation:
Washington State University at Tri-Cities, Richland, Washington 99352, USA
L. R. Pederson
Affiliation:
Pacific Northwest Laboratory, P.O. Box 999, Richland, Washington 99352, USA
W. J. Weber
Affiliation:
Pacific Northwest Laboratory, P.O. Box 999, Richland, Washington 99352, USA
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Abstract

Water uptake and conduction have been studied in SrYb0.05Ce0.95O3-δ, a composition known to conduct protons, oxygen ions, and electrons, depending on temperature and environment. Water uptake kinetics evaluated by thermogravimetry occurred in two distinct stages: a rapid, initial weight gain (0.39±0.09 eV, attributed to grain boundary and near surface hydration) followed by a much slower uptake (2.8±0.4 eV, attributed to hydration of the bulk grains). From cyclic voltammetry and mass spectrometry measurements for a cell exposed to asymmetric conditions, currents and activation energies for electronic, oxygen ion, and proton conduction were determined. The activation energy for electronic conduction, 0.90±0.09 eV, is believed to be artificially high due to the increase in electron carrier concentration with increased temperature. The activation energy for oxygen ion conduction (0.97±0.10 eV) agrees well with other oxygen conductors. Proton conduction appeared to follow two different mechanisms: a low temperature process characterized by an activation energy of 0.42±0.04 eV, and a high temperature process, characterized by an activation energy of 1.38±0.13 eV. A possible explanation is that proton conduction at low temperatures is dominated by grain boundaries and is dominated by bulk conduction at higher temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 369: Symposium U – Solid State Ionics IV , 1994 , 427
Copyright
Copyright © Materials Research Society 1995

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