Structural and vibrational study of diarsenate barium: Ba2As2O7

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• 作者：F. Edhokkar (1) <br> A. Hadrich (1) <br> T. Mhiri (1) <br> M. Graia (2) <br>
• 刊名：Crystallography Reports
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：59
• 期：7
• 页码：937-943
• 全文大小：576 KB
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• 作者单位：F. Edhokkar (1) <br> A. Hadrich (1) <br> T. Mhiri (1) <br> M. Graia (2) <br><br>1. Laboratoire de L’état Solide, Faculté des Sciences, Université de Sfax, BPW 3038, Sfax, Tunisie <br> 2. Laboratoire de Matériaux et de Cristallochimie, Faculté des Sciences de Tunis, Université de Tunis-El Manar, 2092, El Manar II Tunis, Tunisie <br>
• ISSN：1562-689X

文摘

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 \(P\bar 1\) , a = 7.384(2) ?, b = 7.402(2) ?, c = 13.318(2) ?; α = 93.69(2)°, β = 96.90(2)°, γ = 90.15(2)°, Z = 4 and V = 721.05(3) ?3. Its structure is composed of BaO8b>/BaO9b> polyhedra and As2b>O7b> 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 As2b>O7b> groups are eclipsed within As-O-As angle of 9.726° and 13.586°. The infrared and the Raman spectra of this compound are reported and discussed.