Crystal Structure of Sr(AsUO_6)_2 · 8H_2O

D. Yu. Pushcharovskii; E. V. Suleimanov; M. Pasero; S. Merlino; A. V. Barinova; E. V. Alekseev

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Crystal Structure of Sr(AsUO_6)_2 · 8H_2O

机译：Sr（AsUO_6）_2·8H_2O的晶体结构

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The crystal structure of the compound Sr(AsUO_6)_2 · 8H_2O is determined by X-ray diffraction analysis (monoclinic system, sp. gr. Pc, unit-cell parameters a = 7.154(1) A, b = 7.101(1) A, c = 18.901(7) A, β = 92.67(2)°, Z = 2). The structure is built by (001)-parallel [AsUO_6]~- layers formed by flattened square UO_6 bipyraids and AsO_4 tetrahedra. The neighboring layers are connected via SrO_8 square antiprisms. The cavities of the polyhedral framework thus formed are occupied by H_2O molecules. The displacements of the anion complexes by a half-translation with respect to one another along only one lattice period is a characteristic feature of this polymorphous modification of the uran-mica group.

机译：化合物Sr（AsUO_6）_2·8H_2O的晶体结构通过X射线衍射分析确定（单斜晶系，sp。gr。Pc，晶胞参数a = 7.154（1）A，b = 7.101（1）A），c ＝ 18.901（7）A，β＝ 92.67（2）°，Z ＝ 2）。该结构由（001）平行的[AsUO_6]〜-层构成，这些层由扁平的方形UO_6双锥体和AsO_4四面体形成。相邻层通过SrO_8方形反棱镜连接。如此形成的多面体骨架的空腔被H_2O分子占据。阴离子络合物仅沿一个晶格周期相对于彼此的半平移位移是这种铀-云母基团的多态性修饰的特征。

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《Crystallography reports》 |2003年第2期|共4页
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D. Yu. Pushcharovskii; E. V. Suleimanov; M. Pasero; S. Merlino; A. V. Barinova; E. V. Alekseev;
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Crystal Structure of Sr(AsUO_6)_2 · 8H_2O

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