Ionic transport in SrCo{sub 0.85}Ti{sub 0.15}O{sub 3{minus}{delta}} ceramics at high oxygen pressures

Journal Article · Fri Oct 01 04:00:00 EDT 1999 · Materials Research Bulletin

DOI:https://doi.org/10.1016/S0025-5408(99)00192-0· OSTI ID:20020606

Kharton, V V; Viskup, A P; Yaremchenko, A A; Kerko, P F; Naumovich, E N; Kovalevsky, A V

Oxygen permeation through dense ceramic membranes of the SrCo{sub 0.85}Ti{sub 0.15}O{sub 3-{delta}} cubic perovskite solid solution was studied in the range of the membrane feed-side oxygen partial pressures (p{sub 2}) 0.21 to 100 atm at temperatures of 850--1,040 K. The dependence of the oxygen fluxes on membrane thickness suggests that bulk ionic conductivity is the permeation-determining factor at high oxygen pressures (p{sub 2} > 1 atm). Increasing the oxygen pressure up to 80--100 atm was found to result in drastic increase of the permeation flux, accompanied by a partial decomposition of the cubic perovskite phase of SrCo{sub 0.85}Ti{sub 0.15}O{sub 3{minus}{delta}}, forming two isostructural perovskite-type phases. No phase changes were observed after testing ceramics in the oxygen pressure range of 1--60 atm. The high oxygen permeation fluxes obtained demonstrate the applicability of SrCo{sub 0.85}Ti{sub 0.15}O{sub 3{minus}{delta}} membranes at high oxygen pressures.

• Research Organization: Belarus State Univ., Minsk (BY)
• OSTI ID: 20020606
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 12-13 Vol. 34; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT OXIDES
IONIC CONDUCTIVITY
OXYGEN
PEROVSKITES
PRESSURE DEPENDENCE
SOLID SOLUTIONS
STRONTIUM OXIDES
TITANIUM OXIDES