Structural and vibrational study of diarsenate barium: Ba2As2O7

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) Å, b = 7.402(2) Å, c = 13.318(2) Å; α = 93.69(2)°, β = 96.90(2)°, γ = 90.15(2)°, Z =...

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Bibliographic Details
Published in:	Crystallography reports Vol. 59; no. 7; pp. 937 - 943
Main Authors:	Edhokkar, F., Hadrich, A., Mhiri, T., Graia, M.
Format:	Journal Article
Language:	English
Published:	Moscow Pleiades Publishing 01-12-2014
Subjects:	Crystallography and Scattering Methods Physics Physics and Astronomy Structure of Inorganic Compounds Raman Spectrum Crystallography Report Raman Line Crystal Structure Determination Atomic Arrangement
Online Access:	Get full text
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Summary:	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) Å, b = 7.402(2) Å, c = 13.318(2) Å; α = 93.69(2)°, β = 96.90(2)°, γ = 90.15(2)°, Z = 4 and V = 721.05(3) Å 3 . Its structure is composed of BaO 8 /BaO 9 polyhedra and As 2 O 7 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 As 2 O 7 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.
ISSN:	1063-7745 1562-689X
DOI:	10.1134/S1063774514070098