Tetrahedral Chain Order in the Sr2Fe2O5 Brownmillerite

被引：87

作者：

D'Hondt, Hans ^{[1
]}

Abakumov, Artem M. ^{[1
,2
]}

Hadermann, Joke ^{[1
]}

Kalyuzhnaya, Anna S. ^{[2
]}

Rozova, Marina G. ^{[2
]}

Antipov, Evgeny V. ^{[2
]}

Van Tendeloo, Gustaaf ^{[1
]}

机构：

[1] Univ Antwerp, EMAT, B-2020 Antwerp, Belgium

[2] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119992, Russia

来源：

CHEMISTRY OF MATERIALS | 2008年 / 20卷 / 22期

关键词：

D O I：

10.1021/cm801723b

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 crystal structure of the Sr2Fe2O5 browninillerite has been investigated using electron diffraction and high resolution electron microscopy. The Sr2Fe2O5 structure demonstrates two-dimensional order: the tetrahedral chains with two mirror-related configurations (L and k) are arranged within the tetrahedral layers according to the -L-R-L-R- sequence, and the layers themselves are displaced with respect to each other over 1/2[111] or 1/2[11 (1) over bar] vectors of the brownmillerite unit cell, resulting in different ordered stacking variants. A unified superspace model is constructed for ordered stacking sequences in brownmillerites based on the averacge brownmillerite structure with a = 5.5298(4)angstrom, b = 15.5875(12)angstrom, c = 5.6687(4)angstrom, and (3 + 1)-dimensional superspace group 12/m(0 beta gamma)0s, q = beta b* + gamma c*, 0 <= beta <= 1/2, 0 <= gamma <= 1.

引用

页码：7188 / 7194

页数：7

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