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Investigation of the high-temperature redox chemistry of Sr2Fe1.5Mo0.5O6−δvia in situ neutron diffraction
- Source :
- J. Mater. Chem. A. 2:4045-4054
- Publication Year :
- 2014
- Publisher :
- Royal Society of Chemistry (RSC), 2014.
-
Abstract
- 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.
- Subjects :
- Phase transition
Materials science
Hydrogen
Renewable Energy, Sustainability and the Environment
Inorganic chemistry
Neutron diffraction
Analytical chemistry
Oxide
chemistry.chemical_element
General Chemistry
Redox
Oxygen
chemistry.chemical_compound
Tetragonal crystal system
chemistry
Oxidizing agent
General Materials Science
Subjects
Details
- ISSN :
- 20507496 and 20507488
- Volume :
- 2
- Database :
- OpenAIRE
- Journal :
- J. Mater. Chem. A
- Accession number :
- edsair.doi...........4df3e3a4a108d258a4d6083b782b147b