CsUV{sub 3}O{sub 11}, a new uranyl vanadate with a layered structure
- Univ. des Sciences et Technologies de Lille, Villeneuve d`Ascq (France). Lab. de Cristallochimie et Physicochimie du Solide
- Univ. Chouaib Doukkali, El Jadida (Morocco). Lab. de Chimie de Coordination et Analytique
A new cesium uranyl vanadate CsUV{sub 3}O{sub 11} has been synthesized by solid state reaction. Its crystal structure has been determined from single-crystal X-ray diffraction data. It crystallizes in the monoclinic system with space group P2{sub 1}/a and unit cell parameters a = 11.904(2) {angstrom}, b = 6.8321(6) {angstrom}, c = 12.095(2) {angstrom}, {beta} = 106.989(5){degree}, Z = 4, and D{sub exp} = 4.89(2) g/cm{sup 3}. A full-matrix least squares refinement yielded R = 0.046 and R{sub w} = 0.045 for 1831 independent reflections with I > 3{sigma}(I) collected on a Nonius CAD4 diffractometer (MoK{alpha} radiation). The structure of CsUV{sub 3}O{sub 11} is characterized by [UV{sub 3}O{sub 11}]{sub {infinity}} layers parallel to the (001) plane. The layers, very similar to those found in UV{sub 3}O{sub 10}, are built up from VO{sub 5} square pyramids sharing corners of their equatorial bases and UO{sub 8} hexagonal bipyramids, the U atoms occupying the hexagonal holes created by the VO{sub 5} array. The Cs{sup +} ions are located between two successive layers and hold them together; the Cs{sup +} ions and two layers constitute a neutral sandwich {l_brace}(UV{sub 3}O{sub 11}{sup {minus}})-(Cs){sub 2}{sup 2+}-(UV{sub 3}O{sub 11}{sup {minus}}){r_brace}. In this unusual structure, the neutral sandwiches are stacked one above another along the [104] direction with no formal chemical bonds between the neutral sandwiches. The Cs mobilities in CsUV{sub 3}O{sub 11} and Cs carnotite are compared.
- OSTI ID:
- 679267
- Journal Information:
- Journal of Solid State Chemistry, Vol. 146, Issue 1; Other Information: PBD: Aug 1999
- Country of Publication:
- United States
- Language:
- English
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