Phase stability of the mixed-conducting Sr-Fe-Co-O system.
Mixed-conducting ceramic oxides have potential uses in high-temperature electrochemical applications such as solid oxide fuel cells, batteries, sensors, and oxygen-permeable membranes. The Sr-Fe-Co-O system combines high electronic/ionic conductivity with appreciable oxygen permeability at elevated temperatures. Dense ceramic membranes made of this material can be used to separate high-purity oxygen from air without the need for external electrical circuitry, or to partially oxidize methane to produce syngas. Samples of Sr{sub 2}Fe{sub 3{minus}x}Co{sub x}O{sub y} (with x = 0, 0.6, 1.0, and 1.4) were prepared by solid-state reaction method in atmospheres with various oxygen partial pressures (pO{sub 2}) and were characterized by X-ray diffraction, scanning electron microscopy, and electrical conductivity testing. Phase components of the sample are dependent on cobalt concentration and pO{sub 2}. Electrical conductivity increases with increasing temperature and cobalt content in the material.
- Research Organization:
- Argonne National Lab., IL (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 8099
- Report Number(s):
- ANL/ET/CP-93672
- Country of Publication:
- United States
- Language:
- English
Similar Records
Structure and property relationship in the mixed-conducting Sr-Fe-Co-O system.
Structure and property relationships in mixed-conducting Sr{sub 4}(Fe{sub 1{minus}x}Co{sub x}){sub 6}O{sub 13{+-}{delta}} materials
Related Subjects
30 DIRECT ENERGY CONVERSION
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
36 MATERIALS SCIENCE
CERAMICS
COBALT OXIDES
ELECTRIC BATTERIES
ELECTRIC CONDUCTIVITY
IRON OXIDES
MATERIALS
MEMBRANES
METHANE
OXYGEN PLANTS
PARTIAL OXIDATION PROCESSES
PHASE STUDIES
SCANNING ELECTRON MICROSCOPY
SOLID OXIDE FUEL CELLS
STABILITY
STRONTIUM OXIDES
X-RAY DIFFRACTION