Crystal structure and magnetic properties of Na{sub 9}V{sub 14}O{sub 35}: Sodium-vanadium bronze {eta}-Na{sub x}V{sub 2}O{sub 5}
- Univ. of Tokyo (Japan). Materials Design and Characterization Lab.
- Kyoto Univ. (Japan)
The crystal structure of {eta}-Na{sub 1.3}V{sub 2}O{sub 5}, a member of Na{sub x}V{sub 2}O{sub 5} bronze family, has been determined by single-crystal X-ray study: its actual stoichiometric formula is denoted by Na{sub 9}V{sub 14}O{sub 35}. The monoclinic system P2/c was confirmed with a = 15.209(8) {angstrom}, b = 5.036(5) {angstrom}, c = 20.786(6) {angstrom}, {beta} = 109.18(3){degree} with Z = 2. The refinements converged to R = 0.036 and R{sub w} = 0.037 for 3,848 reflections with I > 3{sigma}(I). The structure is of a layer type consisting of V{sub 2}O{sub 5} layers and interlayer Na atoms. The V{sub 2}O{sub 5} layer adopts a novel framework built up with edge-sharing VO{sub 5} square pyramids for five V atoms (four V{sup 4+} and one V{sup 4.5+}) and vertex-sharing VO{sub 4} tetrahedra for two V atoms (V{sup 5+}). Low-dimensional behavior with a spin gap was observed in the magnetic susceptibility but the structure is dissimilar to any structure type of low-dimensional spin-gap systems. The compound probably presents a new type of spin-gap system. 18 refs., 2 figs., 5 tabs.
- OSTI ID:
- 679238
- Journal Information:
- Journal of Solid State Chemistry, Vol. 145, Issue 1; Other Information: PBD: Jun 1999
- Country of Publication:
- United States
- Language:
- English
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