Journal
SOLID STATE IONICS
Volume 143, Issue 1, Pages 117-123Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0167-2738(01)00839-6
Keywords
proton conduction; lanthanum tungsten oxide; lanthanum borate; concentration cell; electrochemical hydrogen pumping
Categories
Ask authors/readers for more resources
Ionic conduction in two non-perovskite-oxides, fluorite-related-type lanthanum tungsten oxide and aragonite-structure lanthanum borate, was investigated at elevated temperatures. LaxWO3+1.5x (x congruent to 6) with a fluorite-related structure showed protonic conduction under hydrogen-containing atmospheres. The emf of a hydrogen concentration cell showed that the ionic transport number in hydrogen was about 0.7-0.9. The result of an electrochemical hydrogen pumping experiment using LaxWO3+1.5x directly evidenced the protonic conduction in this oxide. Partial substitution of Zr for La lowered the electrical conductivity, while the influence of Nd substitution was small. The electrical conductivity of the aragonite-type oxide salt LaBO3 increased by doping with Sr, although the conductivities of these ceramics were not high. The emf values of a hydrogen concentration cell using lanthanum borate (LaBO3) were stable and close to theoretical values, suggesting that electrical conduction in this oxide was due to protons. (C) 2001 Elsevier Science B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available