Sr2MgMoO6-δ: Structure, phase stability, and cation site order control of reduction

Carlos Bernuy-Lopez; Mathieu Allix; Craig A. Bridges; John B. Claridge; Matthew J. Rosseinsky

doi:10.1021/cm0624116

Sr₂MgMoO_6-δ: Structure, phase stability, and cation site order control of reduction

Carlos Bernuy-Lopez, Mathieu Allix, Craig A. Bridges, John B. Claridge, Matthew J. Rosseinsky

Research output: Contribution to journal › Article › peer-review

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Abstract

The potential solid oxide fuel cell anode material Sr₂MgMoO ₆ adopts a √2 × √2 × 2I1̄ superstructure of the simple perovskite cell, derived from an a⁰a⁰c ^- tilt system via distortion of the Mg- and Mocentered 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.

Original language	English
Pages (from-to)	1035-1043
Number of pages	9
Journal	Chemistry of Materials
Volume	19
Issue number	5
DOIs	https://doi.org/10.1021/cm0624116
State	Published - Mar 6 2007
Externally published	Yes

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abstract = "The potential solid oxide fuel cell anode material Sr2MgMoO 6 adopts a √2 × √2 × 2I{\=1} superstructure of the simple perovskite cell, derived from an a0a0c - tilt system via distortion of the Mg- and Mocentered 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.",

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T2 - Structure, phase stability, and cation site order control of reduction

AU - Bernuy-Lopez, Carlos

AU - Allix, Mathieu

AU - Bridges, Craig A.

AU - Claridge, John B.

AU - Rosseinsky, Matthew J.

PY - 2007/3/6

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N2 - The potential solid oxide fuel cell anode material Sr2MgMoO 6 adopts a √2 × √2 × 2I1̄ superstructure of the simple perovskite cell, derived from an a0a0c - tilt system via distortion of the Mg- and Mocentered 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.

AB - The potential solid oxide fuel cell anode material Sr2MgMoO 6 adopts a √2 × √2 × 2I1̄ superstructure of the simple perovskite cell, derived from an a0a0c - tilt system via distortion of the Mg- and Mocentered 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.

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Sr₂MgMoO_6-δ: Structure, phase stability, and cation site order control of reduction

Abstract

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