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Mixed Ionic-Electronic Conduction in N1 Doped Lanthanum Gallate Perovskites

Published online by Cambridge University Press:  10 February 2011

N. J. Long ,
H. L. Tuller ,
Lower Hurt  and
New Zealand
N. J. Long
Affiliation:
Industrial Research Limited Gracefield Rd, PO Box 31–310
H. L. Tuller
Affiliation:
Crystal Physics and Electroceramics Laboratory Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge, MA 02139, U.S.A.
Lower Hurt
Affiliation:
Crystal Physics and Electroceramics Laboratory Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge, MA 02139, U.S.A.
New Zealand
Affiliation:
Crystal Physics and Electroceramics Laboratory Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge, MA 02139, U.S.A.
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Abstract

Lanthanum gallate is a promising material for “monolithic” fuel cells or oxygen pumps, i.e. one in which the electrolyte and electrodes are formed from a common phase. We have investigated La1−xSrxGa1–yNiyO3 (LSGNx-y) with x=0.1 and y=0.2 and 0.5 as a potential cathode material for such an electrochemical device. The σ(PO2,T) for LSGN10–20 points to a p-type electronic conductivity at high PO2 and predominantly ionic conductivity at low PO2. LSGN10–50 has an electronic conductivity suitable for SOFC applications of approximately 50 S/cm in air at high temperature. AC impedance spectroscopy on an electron blocking cell of the form M/LSG/LSGN/LSG/M was used to isolate the ionic conductivity in the LSGN10–20 material. The ionic conductivity was found to have a similar magnitude and activation energy to that of undoped LSG material with σi= 0.12 S/cm at 800°C and EA= 1.0 ± 0.1 eV. Thermal expansion measurements on the LSGN materials were characterized as a function of temperature and dopant level and were found to match that of the electrolyte under opeating conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 496: Symposium Y – Materials For Electrochemical Energy Storage & Conversion II… , 1997 , 129
Copyright
Copyright © Materials Research Society 1998

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References

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