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Structural and vibrational study of diarsenate barium: Ba2As2O7

机译：砷酸钡的结构和振动研究：Ba2As2O7

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摘要

A new barium diarsenate with layer structure has been synthesized by solid-state method. The single crystal structure was solved and refined by X-ray diffraction. The crystal is triclinic, space group , a = 7.384(2) , b = 7.402(2) , c = 13.318(2) ; alpha = 93.69(2)A degrees, beta = 96.90(2)A degrees, gamma = 90.15(2)A degrees, Z = 4 and V = 721.05(3) (3). Its structure is composed of BaO8/BaO9 polyhedra and As2O7 bitetrahedral units of dichromate type. These groups are linked by corner and edge-sharing forming a three-dimensional framework. Two unique diarsenate groups are repeated by lattice translations to form layers. The As2O7 groups are eclipsed within As-O-As angle of 9.726A degrees and 13.586A degrees. The infrared and the Raman spectra of this compound are reported and discussed.
机译：采用固态法合成了一种新型的层状二砷酸钡。通过X射线衍射解析并细化了单晶结构。晶体是三斜晶系的空间群，a = 7.384（2），b = 7.402（2），c = 13.318（2）; alpha = 93.69（2）A度，beta = 96.90（2）A度，gamma = 90.15（2）A度，Z = 4和V = 721.05（3）（3）。它的结构由重铬酸盐类型的BaO8 / BaO9多面体和As2O7二面体单元组成。这些组通过角落和边缘共享链接在一起，形成了一个三维框架。通过晶格平移重复两个独特的砷酸根基团以形成层。 As2O7基团在9.726A度和13.586A度的As-O-As角度内黯然失色。报告并讨论了该化合物的红外光谱和拉曼光谱。

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