Investigation of the high-temperature redox chemistry of Sr₂Fe₁.₅Mo₀.₅O₆₋δvia in situ neutron diffraction
2014
Bugaris, Daniel E. | Hodges, Jason P. | Huq, Ashfia | Chance, W Michael | Heyden, Andreas | Chen, Fanglin | Loye, Hans-Conrad zur
Crystallographic structural changes were investigated for Sr₂Fe₁.₅Mo₀.₅O₆₋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.
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