Oxygen permeability of LaGa{sub 0.65}Ni{sub 0.20}Mg{sub 0.15}O{sub 3-{delta}} ceramics: effect of synthesis method
Journal Article
·
· Materials Research Bulletin
Oxygen ionic transport in dense LaGa{sub 0.65}Ni{sub 0.20}Mg{sub 0.15}O{sub 3-{delta}} membranes, prepared by the standard ceramic synthesis technique and via glycine-nitrate process (GNP), was studied using measurements of the total conductivity, oxygen permeation and faradaic efficiency (FE). At 1223 K oxygen transfer through LaGa{sub 0.65}Ni{sub 0.20}Mg{sub 0.15}O{sub 3-{delta}} ceramics is mainly determined by the bulk ambipolar conductivity, while decreasing temperature leads to a greater role of the surface exchange rate. In spite of moderate difference in the ceramic microstructures, the surface exchange limitations are considerably higher for the membranes prepared by the standard ceramic route compared to GNP-synthesized material. Thermal expansion and partial ionic and electronic conductivities were found essentially independent of the synthesis method. The level of oxygen ionic conduction in LaGa{sub 0.65}Ni{sub 0.20}Mg{sub 0.15}O{sub 3-{delta}}, characterized by the activation energy of about 150 kJ/mol and ion transference numbers in the range 1x10{sup -3}-5x10{sup -2} at 973-1223 K, is higher than that in La(Ga,Ni)O{sub 3-{delta}} perovskites and comparable to La{sub 2}NiO{sub 4}-based phases.
- OSTI ID:
- 20884642
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 2 Vol. 38; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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