Investigation of the High-Temperature Redox Chemistry of Sr₂Fe_1.5Mo_0.5O_6−δ via in situ Neutron Diffraction

Author(s)

Daniel E. Bugaris, University of South Carolina - ColumbiaFollow
Jason P. Hodges, Oak Ridge National Laboratory, Oak Ridge, TN
Ashfia Huq, Oak Ridge National Laboratory, Oak Ridge, TN
W. Michael Chance, University of South Carolina - Columbia
Andreas Heyden, University of South Carolina - ColumbiaFollow
Fanglin Chen, University of South Carolina - ColumbiaFollow
Hans-Conrad zur Loye, University of South Carolina - ColumbiaFollow

Document Type

Article

Subject Area(s)

Chemistry

Abstract

Crystallographic structural changes were investigated for Sr₂Fe_1.5Mo_0.5O_6−δ, an electrode material for symmetric solid oxide fuel cells. The samples of this material were heated and cooled in wet hydrogen and wet oxygen atmospheres, to simulate the reducing and oxidizing conditions experienced under actual fuel cell operating conditions, and their structures and oxygen contents were determined using in situ powder neutron diffraction. The existence of a reversible tetragonal to cubic phase transition was established to occur between room temperature and 400 °C, both on heating and cooling in either oxygen or hydrogen. The oxygen content reaches a low value of 5.50(2) at 850 °C in wet hydrogen. Excellent correlations are observed between the oxygen content of the structure and the conductivities reported in the literature.

Digital Object Identifier (DOI)

https://doi.org/10.1039/C3TA14913G

Publication Info

Published in Journal of Materials Chemistry A, Volume 2, Issue 11, 2014, pages 4045-4054.

Rights

© Journal of Materials Chemistry A 2014, Royal Society of Chemistry.

APA Citation

Bugaris, D., Hodges, J., Huq, A., Chance, W., Heyden, A., Chen, F., & zur Loye, H.-C. (2014). Investigation of the High-Temperature Redox Chemistry of Sr2Fe1.5Mo0.5O6−δ via in situ Neutron Diffraction. Journal of Materials Chemistry A, 2(11), 4045–4054. https://doi.org/10.1039/C3TA14913G