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Sr2MgMoO6-δ: Structure, Phase Stability, and Cation Site Order Control of Reduction
- Source :
- Chemistry of Materials. 19:1035-1043
- Publication Year :
- 2007
- Publisher :
- American Chemical Society (ACS), 2007.
-
Abstract
- The potential solid oxide fuel cell anode material Sr2MgMoO6 adopts a √2 × √2 × 2 I1 superstructure of the simple perovskite cell, derived from an a0a0c- tilt system via distortion of the Mg- and Mo-centered octahedra. Reduction of Sr2MgMoO6 appears to be correlated with antisite disorder at either point or extended antiphase defects. The degree of reduction is small at temperatures below 900 °C. Upon further reduction above 900 °C, Sr2MgMoO6 begins to decompose into a reduced material modeled as an n = 2 Ruddlesden−Popper phase with a significantly higher Mo:Mg ratio, MgO, and Mo. Diffraction data are consistent with the reduced material being significantly intergrown with the perovskite matrix.
Details
- ISSN :
- 15205002 and 08974756
- Volume :
- 19
- Database :
- OpenAIRE
- Journal :
- Chemistry of Materials
- Accession number :
- edsair.doi...........935f971e4e61c881ee2766537feb585d