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Effect of Atmospheric Carbon Dioxide on Surface Segregation and Phase Formation in La0.6Sr0.4Co0.2Fe0.8O3-δ Thin Films

Published online by Cambridge University Press:  31 March 2014

Yang Yu ,
Deniz Cetin ,
Heng Luo ,
Xi Lin ,
Karl Ludwig ,
Uday Pal ,
Srikanth Gopalan  and
Soumendra Basu
Yang Yu
Affiliation:
Division of Materials Science and Engineering, Boston University, Brookline, MA 02446, U.S.A.
Deniz Cetin
Affiliation:
Division of Materials Science and Engineering, Boston University, Brookline, MA 02446, U.S.A.
Heng Luo
Affiliation:
Department of Mechanical Engineering, Boston University, Boston, MA 02215, U.S.A.
Xi Lin
Affiliation:
Division of Materials Science and Engineering, Boston University, Brookline, MA 02446, U.S.A. Department of Mechanical Engineering, Boston University, Boston, MA 02215, U.S.A.
Karl Ludwig
Affiliation:
Division of Materials Science and Engineering, Boston University, Brookline, MA 02446, U.S.A. Physics Department, Boston University, Boston, MA 02215, U.S.A.
Uday Pal
Affiliation:
Division of Materials Science and Engineering, Boston University, Brookline, MA 02446, U.S.A. Department of Mechanical Engineering, Boston University, Boston, MA 02215, U.S.A.
Srikanth Gopalan
Affiliation:
Division of Materials Science and Engineering, Boston University, Brookline, MA 02446, U.S.A. Department of Mechanical Engineering, Boston University, Boston, MA 02215, U.S.A.
Soumendra Basu
Affiliation:
Division of Materials Science and Engineering, Boston University, Brookline, MA 02446, U.S.A. Department of Mechanical Engineering, Boston University, Boston, MA 02215, U.S.A.
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Abstract

This study investigates Sr surface segregation behavior and phase formation in La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF), a commonly used cathode material for solid oxide fuel cells (SOFCs). (100)-oriented LSCF thin films were deposited on (110)-oriented NdGaO3 (NGO) substrates by Pulsed Laser Deposition (PLD). The samples were annealed in atmospheres with various CO2 partial pressures at 800°C. Using the synchrotron technique of Total Reflection X-ray Fluorescence (TXRF), surface segregation in these thin films were quantified. The morphological changes at the surface were examined by AFM studies. The kinetics and thermodynamics of the segregation are discussed.

Keywords

surface reactionenergetic materialx-ray fluorescence
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1647: Symposium GG – Surface/Interface Characterization and Renewable Energy , 2014 , mrsf13-1647-gg06-08
Copyright
Copyright © Materials Research Society 2014 

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References

REFERENCES

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