Oxygen-vacancy concentration in A{sub 2}MgMoO{sub 6-{delta}} double-perovskite oxides

Journal Article · Wed Jul 15 00:00:00 EDT 2009 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.04.016· OSTI ID:21370473

Matsuda, Y ^[1]; Karppinen, M ^[1]; Yamazaki, Y ^[2]; Yamauchi, H ^[1]

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1. Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503 (Japan)
2. Department of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama 226-8502 (Japan)

Accurate oxygen-content analysis by means of a coulometric redox titration method specially devised for the purpose shows that as-synthesized (in 5% H{sub 2}/Ar) samples of the recently reported novel solid oxide fuel cells anode material Sr{sub 2}MgMoO{sub 6-{delta}} contain oxygen vacancies with a concentration of {delta}{approx}0.05. Oxygen contents and the resultant Mo-valence values are also analyzed for various A{sub 2}MgMoO{sub 6-{delta}} samples in order to reveal both the isovalent and aliovalent A-site cation substitution effects. - Graphical Abstract: A highly reproducible coulometric redox titration method has been developed to accurately analyze the mixed V/VI valence state of molybdenum and thereby the oxygen content in the recently reported SOFC-anode materials of A{sub 2}MgMoO{sub 6-{delta}}.

• OSTI ID: 21370473
• Journal Information: Journal of Solid State Chemistry, Vol. 182, Issue 7; Other Information: DOI: 10.1016/j.jssc.2009.04.016; PII: S0022-4596(09)00179-0; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANODES
ARGON
HYDROGEN
MAGNESIUM COMPOUNDS
MOLYBDATES
OXIDES
OXYGEN
PEROVSKITE
SOLID OXIDE FUEL CELLS
TITRATION
VACANCIES
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL ANALYSIS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
ELECTRODES
ELEMENTS
FLUIDS
FUEL CELLS
GASES
HIGH-TEMPERATURE FUEL CELLS
MINERALS
MOLYBDENUM COMPOUNDS
NONMETALS
OXIDE MINERALS
OXYGEN COMPOUNDS
PEROVSKITES
POINT DEFECTS
QUANTITATIVE CHEMICAL ANALYSIS
RARE GASES
REFRACTORY METAL COMPOUNDS
SOLID ELECTROLYTE FUEL CELLS
TRANSITION ELEMENT COMPOUNDS
VOLUMETRIC ANALYSIS