Oxygen permeability of LaFe{sub 1{minus}x}Ni{sub x}O{sub 3{minus}{delta}} solid solutions
Mixed-conducting perovskites are of considerable interest for industrial applications such as cathodes of solid oxide fuel cells and ceramic membranes for high-purity oxygen separation and partial oxidation of hydrocarbons. Incorporation of nickel into the iron sublattice of LaFeO{sub 3{minus}{delta}} was found to result in increasing oxygen nonstoichiometry, electrical conductivity, and thermal expansion of the perovskites. Activation energy for electrical conductivity of the LaFe{sub 1{minus}x}Ni{sub x}O{sub 3{minus}{delta}} (x = 0.2--0.5) decreases with x in the range from 23.9 to 6.6 kJ/mol. Thermal expansion coefficients of the ceramic materials calculated from the dilatometric data were (8.9--11.9) x 10{sup {minus}6} K{sup {minus}1}. Oxygen permeation through LaFe{sub 1{minus}x}Ni{sub x}O{sub 3{minus}{delta}} membranes was found to increase with nickel content due to increasing oxygen vacancy concentration and bulk ionic conductivity, which are the permeation flux-limiting factors.
- Research Organization:
- Belarus State Univ., Minsk (BY)
- OSTI ID:
- 20006001
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 8 Vol. 34; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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