Processing and electrochemical properties of mixed conducting La{sub 1-x}A{sub x}Co{sub 1-y}Fe{sub y}O{sub 3-{delta}} (A=Sr, Ca)
- Resource Type
- Conference
- Authors
- Source
- Conference: Fall meeting of the Materials Research Society (MRS),Boston, MA (United States),28 Nov - 9 Dec 1994; Other Information: PBD: Nov 1994
- Subject
- 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE LANTHANUM OXIDES
ELECTROCHEMISTRY
STRONTIUM OXIDES
CALCIUM OXIDES
COBALT OXIDES
IRON OXIDES
ELECTRIC CONDUCTIVITY
IONIC CONDUCTIVITY
OXYGEN
DIFFUSION
THERMAL GRAVIMETRIC ANALYSIS 400400
PHYSICAL PROPERTIES
- Language
- English
Powder compositions in the series La{sub 1-x}A{sub x}Co{sub 1-y}Fe{sub y}O{sub 3-{delta}} (A = Sr, Ca) have been prepared by a combustion synthesis method. Sintering of pressed powders produced high-density test specimens with the perovskite structure. The specimens exhibited high electrical conductivities with appreciable oxygen-ion conductivity that increased with Co content for the compositions studied. Oxygen permeation studies showed a significant flux of oxygen that increased with temperature for specimens in a P(O{sub 2}) gradient with no applied field. Thermogravimetric studies of the La{sub 1-x}Sr{sub x}Co{sub 0.2}Fe{sub 0.8}O{sub 3-{delta}} system indicated a reversible mass loss with increasing temperature that increased with Sr content.