Synthesis and crystal structure of {sigma}-Zn{sub 0.25}V{sub 2}O{sub 5} {center_dot} H{sub 2}O with a novel type of V{sub 2}O{sub 5} layer
- Kyoto Univ. (Japan)
A new layered vanadium bronze designated as {sigma}-phase Zn{sub 0.25}V{sub 2}O{sub 5} {center_dot} H{sub 2}O has been hydrothermally synthesized from ZnCl{sub 2} and VO(OH){sub 2}. A single-crystal study revealed the triclinic system P1: a = 10.614(2){angstrom}, b = 8.031(3) {angstrom}, c = 10.7688(9) {angstrom}, {alpha} = 90.65(1){degrees}, {beta} = 91.14(1){degrees}, {gamma} = 90.09(2){degrees}, and Z = 8. The structure was solved and refined to R/R{sub w} = 0.079/0.048 for 1580 reflections with I > 3{sigma}(I), which consists of V{sub 2}O{sub 5} layers stacking along the c axis and interstitial hydrated Zn{sup 2+} ions. Th eV{sub 2}O{sub 5} layer adopts a novel polyhedral framework built up of VO{sub 6} octahedra, VO{sub 5} trigonal bipyramids, and VO{sub 4} tetrahedra. When projected parallel to the ab plane, the V{sub 2}O{sub 5} layer is described by the atomic sheet model in a manner similar to the V{sub 2}O{sub 5} layer of {delta} phase such as {delta}-Ag{sub x}V{sub 2}O{sub 5}, that is, a double-sheet type composed of two V{sub 2}O{sub 5} sheets facing each other. The interstitial Zn atom forms a ZnO{sub 6} octahedron with two apical oxygens of the VO{sub 4} tetrahedra on opposite sides and with four coplanar water molecules. The anhydrous {sigma} phase was obtained by heating the hydrate up to 200{degrees}C accompanied by the contraction in layer spacing from 10.76 to 8.92 {angstrom}.
- OSTI ID:
- 478920
- Journal Information:
- Journal of Solid State Chemistry, Vol. 126, Issue 1; Other Information: PBD: Oct 1996
- Country of Publication:
- United States
- Language:
- English
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