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Synthesis and crystal structure of Sr2As2O7 from single-crystal data

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The title compound, strontium diarseniate Sr2As2O7, was prepared by solid-state method. This compound crystallizes in the tetragonal system, space group P41 with a = 7.142 (5) Å; c = 25.693 (5) Å and Z = 8. Its structure is composed of SrO7–9 polyhedra and [As2O7] bitetrahedral units. These groups are linked together by corner and edge-sharing forming a three dimensional framework. The crystal structure of the title compound has been the subject of a previous investigation based on X-ray powder data [M. Weil, T. dordevic, C. L. Lengauer, U. Kolitsch Solid State Sciences 11 (2009), 2111–2117]. The present investigation confirms the previous study, but with higher precision and with all displacement parameters refined anisotropically. Sr2As2O7 is isotypic with the high-temperature polymorphs of Ca2P2O7 and Sr2V2O7.

Document Type: Research Article

DOI: http://dx.doi.org/10.1088/1757-899X/28/1/012017

Publication date: January 1, 2012

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