Saparov Bayrammurad, Bobev Svilen
Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USA.
Acta Crystallogr Sect E Struct Rep Online. 2011 Jan 15;67(Pt 2):i11. doi: 10.1107/S1600536811000274.
The title compound, Eu(5)Cd(2)Sb(5)O adopts the Ba(5)Cd(2)Sb(5)F-type structure (Pearson symbol oC52), which contains nine crystallographically unique sites in the asymmetric unit, all on special positions. One Eu, two Sb, and the Cd atom have site symmetry m..; two other Eu, the third Sb and the O atom have site symmetry m2m; the remaining Eu atom has 2/m.. symmetry. Eu atoms fill penta-gonal channels built from corner-sharing CdSb(4) tetra-hedra. The isolated O atom, i.e., an oxide ion O(2-), is located in a distorted tetra-hedral cavity formed by four Eu cations.
标题化合物Eu(5)Cd(2)Sb(5)O采用Ba(5)Cd(2)Sb(5)F型结构（皮尔逊符号oC52），其不对称单元包含9个晶体学上独特的位点，均位于特殊位置。一个Eu、两个Sb和Cd原子具有位点对称性m..；另外两个Eu、第三个Sb和O原子具有位点对称性m2m；其余的Eu原子具有2/m..对称性。Eu原子填充由共角CdSb(4)四面体构建的五角形通道。孤立的O原子，即氧离子O(2-)，位于由四个Eu阳离子形成的扭曲四面体腔中。
