Abstract

Strontium and barium uranyl phosphate and uranyl arsenate hydrates have been synthesized by diffusion in gels (SrUP11, Sr[(UO2)(PO4)]2(H2O)11, SrUAs11, Sr[(UO2)(AsO4)]2(H2O)11, synthetic heinrichite, Ba[(UO2)(AsO4)]2(H2O)10), or by hydrothermal methods (synthetic meta-uranocircite I, Ba[(UO2)(PO4)]2(H2O)7), and their crystal structures have been determined. Single-crystal X-ray-diffraction intensity data were collected at room temperature using MoK radiation and a CCD-based area detector. The crystal structures of the four compounds were solved by direct methods and refined by full-matrix least-squares techniques on the basis of F 2 for all unique reflections to agreement indices (SrUP11, SrUAs11, synthetic heinrichite and syn

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