Oxygen ionic transport in A-site-deficient perovskites La(Pb)FeO{sub 3}
- Belarus State Univ., Minsk (Belarus). Inst. of Physicochemical Problems
Formation of perovskite-type solid solutions were found in the oxide system La{sub 1{minus}x}Pb{sub x}FeO{sub 3{minus}{delta}} (x = 0.1--0.3). Synthesis and sintering of the ceramics at temperatures above 1300 K led to a cation deficiency in the lanthanum sublattice, due to lead oxide evaporation. Electrical conductivity and oxygen permeation fluxes were ascertained to increase with increasing x. Oxygen permeability values of the La{sub 1{minus}x}Pb{sub x}FeO{sub 3{minus}{delta}} cation-deficient ceramics were considerably less than those of La{sub 1{minus}x}Sr{sub x}FeO{sub 3{minus}{delta}}. Permeation fluxes through La{sub 1{minus}x}Pb{sub x}FeO{sub 3{minus}{delta}} were demonstrated to be limited by the bulk ionic conductivity. Thermal expansion coefficients of the oxides were (10.0--10.4) {times} 10{sup {minus}6} K{sup {minus}1}.
- OSTI ID:
- 638353
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 7 Vol. 33; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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