Abstract
The chemical reactivity and interdiffusion of (La,Sr)MnO{sub 3} and (Zr,Y)O{sub 2} was studied from 1170K to 1755K. Reaction of LaMnO3 with (Zr,Y)O{sub 2} was already observed at 1170K, whereas reactions between (La,Sr)MnO{sub 3} with 30 at.% Sr and (Zr,Y)O{sub 2} with 8 at.% Y were not observed at 1635K. The reaction products observed in the experiments, are La{sub 2}Zr{sub 2}O{sub 7} and/or SrZrO{sub 3}. It is proposed that reaction layers are formed by diffusion of La and/or Sr into (Zr,Y)O{sub 2} via a vacancy diffusion mechanism. The composition of the layers depends on the La{sub 2}O{sub 3} and SrO activities in (La,Sr)MnO{sub 3}. The activation energy for the formation of a La{sub 2}Zr{sub 2}O{sub 7} reaction layer was determined to be 17.5 {+-} 1.8 kJ.mol{sup -1}, the activation energy for the formation of a SrZrO{sub 3} reaction layer was determined to be 18.8 {+-} 1.9 kJ.mol{sup -1}. On the basis of the experiments it was calculated that at 1273K it would take about 29,100 hours to grow a reaction layer of SrZrO{sub 3} from (La{sub 0.5}Sr{sub 0.5})MnO{sub 3} and (Zr{sub 0.97}Y{sub 0.03})O{sub 1.985}, and about 82,000 hours to grow a reaction layer of La{sub 2}Zr{sub 2}O{sub 7} from LaMnO{sub 3}
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Citation Formats
Van Roosmalen, J A.M., and Cordfunke, E H.P.
Chemical reactivity and interdiffusion of (La,Sr)MnO{sub 3} and (Zr,Y)O{sub 2}, solid oxide fuel cell cathode and electrolyte materials.
Netherlands: N. p.,
1991.
Web.
Van Roosmalen, J A.M., & Cordfunke, E H.P.
Chemical reactivity and interdiffusion of (La,Sr)MnO{sub 3} and (Zr,Y)O{sub 2}, solid oxide fuel cell cathode and electrolyte materials.
Netherlands.
Van Roosmalen, J A.M., and Cordfunke, E H.P.
1991.
"Chemical reactivity and interdiffusion of (La,Sr)MnO{sub 3} and (Zr,Y)O{sub 2}, solid oxide fuel cell cathode and electrolyte materials."
Netherlands.
@misc{etde_10132260,
title = {Chemical reactivity and interdiffusion of (La,Sr)MnO{sub 3} and (Zr,Y)O{sub 2}, solid oxide fuel cell cathode and electrolyte materials}
author = {Van Roosmalen, J A.M., and Cordfunke, E H.P.}
abstractNote = {The chemical reactivity and interdiffusion of (La,Sr)MnO{sub 3} and (Zr,Y)O{sub 2} was studied from 1170K to 1755K. Reaction of LaMnO3 with (Zr,Y)O{sub 2} was already observed at 1170K, whereas reactions between (La,Sr)MnO{sub 3} with 30 at.% Sr and (Zr,Y)O{sub 2} with 8 at.% Y were not observed at 1635K. The reaction products observed in the experiments, are La{sub 2}Zr{sub 2}O{sub 7} and/or SrZrO{sub 3}. It is proposed that reaction layers are formed by diffusion of La and/or Sr into (Zr,Y)O{sub 2} via a vacancy diffusion mechanism. The composition of the layers depends on the La{sub 2}O{sub 3} and SrO activities in (La,Sr)MnO{sub 3}. The activation energy for the formation of a La{sub 2}Zr{sub 2}O{sub 7} reaction layer was determined to be 17.5 {+-} 1.8 kJ.mol{sup -1}, the activation energy for the formation of a SrZrO{sub 3} reaction layer was determined to be 18.8 {+-} 1.9 kJ.mol{sup -1}. On the basis of the experiments it was calculated that at 1273K it would take about 29,100 hours to grow a reaction layer of SrZrO{sub 3} from (La{sub 0.5}Sr{sub 0.5})MnO{sub 3} and (Zr{sub 0.97}Y{sub 0.03})O{sub 1.985}, and about 82,000 hours to grow a reaction layer of La{sub 2}Zr{sub 2}O{sub 7} from LaMnO{sub 3} and (Zr{sub 0.92}Y{sub 0.08})O{sub 1.96}, with a thickness of 1 {mu}m for both layers. It is proposed that polarization losses of the Solid Oxide Fuel Cell (SOFC) due to the reaction have more effect than ohmic losses. 3 figs., 6 tabs., 28 refs.}
place = {Netherlands}
year = {1991}
month = {Aug}
}
title = {Chemical reactivity and interdiffusion of (La,Sr)MnO{sub 3} and (Zr,Y)O{sub 2}, solid oxide fuel cell cathode and electrolyte materials}
author = {Van Roosmalen, J A.M., and Cordfunke, E H.P.}
abstractNote = {The chemical reactivity and interdiffusion of (La,Sr)MnO{sub 3} and (Zr,Y)O{sub 2} was studied from 1170K to 1755K. Reaction of LaMnO3 with (Zr,Y)O{sub 2} was already observed at 1170K, whereas reactions between (La,Sr)MnO{sub 3} with 30 at.% Sr and (Zr,Y)O{sub 2} with 8 at.% Y were not observed at 1635K. The reaction products observed in the experiments, are La{sub 2}Zr{sub 2}O{sub 7} and/or SrZrO{sub 3}. It is proposed that reaction layers are formed by diffusion of La and/or Sr into (Zr,Y)O{sub 2} via a vacancy diffusion mechanism. The composition of the layers depends on the La{sub 2}O{sub 3} and SrO activities in (La,Sr)MnO{sub 3}. The activation energy for the formation of a La{sub 2}Zr{sub 2}O{sub 7} reaction layer was determined to be 17.5 {+-} 1.8 kJ.mol{sup -1}, the activation energy for the formation of a SrZrO{sub 3} reaction layer was determined to be 18.8 {+-} 1.9 kJ.mol{sup -1}. On the basis of the experiments it was calculated that at 1273K it would take about 29,100 hours to grow a reaction layer of SrZrO{sub 3} from (La{sub 0.5}Sr{sub 0.5})MnO{sub 3} and (Zr{sub 0.97}Y{sub 0.03})O{sub 1.985}, and about 82,000 hours to grow a reaction layer of La{sub 2}Zr{sub 2}O{sub 7} from LaMnO{sub 3} and (Zr{sub 0.92}Y{sub 0.08})O{sub 1.96}, with a thickness of 1 {mu}m for both layers. It is proposed that polarization losses of the Solid Oxide Fuel Cell (SOFC) due to the reaction have more effect than ohmic losses. 3 figs., 6 tabs., 28 refs.}
place = {Netherlands}
year = {1991}
month = {Aug}
}