Oxygen Ionic and Electronic Transport in LaGa1−xNixO3−δPerovskites
Formation of the LaGa1−xNixO3−δsolid solutions with perovskite structure was ascertained in the concentration range of 0≤x≤0.5. Substitution of gallium with nickel results in increasing oxygen nonstoichiometry and electronic and ionic conductivities. The oxygen ion transference numbers in air at 107...
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Published in | Journal of solid state chemistry Vol. 142; no. 2; pp. 325 - 335 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
San Diego, CA
Elsevier Inc
01.02.1999
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Formation of the LaGa1−xNixO3−δsolid solutions with perovskite structure was ascertained in the concentration range of 0≤x≤0.5. Substitution of gallium with nickel results in increasing oxygen nonstoichiometry and electronic and ionic conductivities. The oxygen ion transference numbers in air at 1070–1220 K determined by the Faradaic efficiency measurements do not exceed 0.005. Oxygen permeation fluxes through LaGa1−xNixO3−δwere found to increase with nickel content and to be limited predominantly by the bulk ionic conductivity. Reducing oxygen partial pressure leads to decreasing electronic transport and increasing ionic conductivity. Thermal expansion coefficients of the ceramics are in the range of (10.8–11.6) ×10−6K−1. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0022-4596 1095-726X |
DOI: | 10.1006/jssc.1998.8041 |