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

被引：107

作者：

Bernuy-Lopez, Carlos ^{[1
]}

Allix, Mathieu ^{[1
]}

Bridges, Craig A. ^{[1
]}

Claridge, John B. ^{[1
]}

Rosseinsky, Matthew J. ^{[1
]}

机构：

[1] Univ Liverpool, Dept Chem, Liverpool L69 7ZD, Merseyside, England

来源：

CHEMISTRY OF MATERIALS | 2007年 / 19卷 / 05期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1021/cm0624116

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The potential solid oxide fuel cell anode material Sr2MgMoO6 adopts a root 2 x root 2 x 2 I (1) over bar superstructure of the simple perovskite cell, derived from an a(0)a(0)c(-) 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 degrees C. Upon further reduction above 900 degrees 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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页码：1035 / 1043

页数：9

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