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Conduction in BaO‐ and MgO‐doped LaGaO3

Conduction in BaO‐ and MgO‐doped LaGaO3 A series of La0.90Ba0.10Ga1−xMgxO3−α (x=0.20, 0.25 and 0.30) ceramics with a perovskite‐type orthorhombic structure were prepared by the conventional solid‐state reaction. Their conduction was studied in wet hydrogen, wet air and dry air atmospheres by various electrochemical methods including AC impedance spectroscopy, isotope effect, electrochemical hydrogen pumping, steam concentration cells and oxygen concentration cells from 873 to1273 K. Proton conduction was confirmed directly by an electrochemical hydrogen‐pumping experiment. The hydrogen evolution rates coincided with theoretical ones calculated from Faraday's law, indicating that in hydrogen atmosphere the charge carriers were predominantly protons. Isotope effect confirmed the ceramic samples possessed proton conduction under water vapor‐containing atmosphere. In wet air atmosphere, the samples were found to be mixed (proton+oxide ion+hole) conductors, and in dry air atmosphere to be mixed (oxide ion+hole) conductors. These results were different from the reports that BaO‐ and MgO‐doped LaGaO3 ceramics were mixed conductors of oxide ion and electron hole in O2 and air; whereas they were oxide ion conductors in N2 and H2 atmospheres. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Chinese Journal of Chemistry Wiley

Conduction in BaO‐ and MgO‐doped LaGaO3

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References (22)

Publisher
Wiley
Copyright
Copyright © 2009 Wiley Subscription Services, Inc., A Wiley Company
ISSN
1001-604X
eISSN
1614-7065
DOI
10.1002/cjoc.201090003
Publisher site
See Article on Publisher Site

Abstract

A series of La0.90Ba0.10Ga1−xMgxO3−α (x=0.20, 0.25 and 0.30) ceramics with a perovskite‐type orthorhombic structure were prepared by the conventional solid‐state reaction. Their conduction was studied in wet hydrogen, wet air and dry air atmospheres by various electrochemical methods including AC impedance spectroscopy, isotope effect, electrochemical hydrogen pumping, steam concentration cells and oxygen concentration cells from 873 to1273 K. Proton conduction was confirmed directly by an electrochemical hydrogen‐pumping experiment. The hydrogen evolution rates coincided with theoretical ones calculated from Faraday's law, indicating that in hydrogen atmosphere the charge carriers were predominantly protons. Isotope effect confirmed the ceramic samples possessed proton conduction under water vapor‐containing atmosphere. In wet air atmosphere, the samples were found to be mixed (proton+oxide ion+hole) conductors, and in dry air atmosphere to be mixed (oxide ion+hole) conductors. These results were different from the reports that BaO‐ and MgO‐doped LaGaO3 ceramics were mixed conductors of oxide ion and electron hole in O2 and air; whereas they were oxide ion conductors in N2 and H2 atmospheres.

Journal

Chinese Journal of ChemistryWiley

Published: Dec 1, 2009

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