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- W2007758601 abstract "Two new mixed valence vanadium oxides Pb1.32V8.35O16.7and PbV6O11have been discovered in the Pb–V–O system. Their crystal structures were determined at room temperature by single-crystal X-ray analysis. Pb1.32V8.35O16.7: monoclinic,I2/m,a= 10.108(3),b= 9.887(3),c= 2.903(1) Å, γ = 90.84(2)°, andZ= 1, finalR= 0.049 for 452 independent refections. PbV6O11: hexagonal,P63mc,a= 5.754(1),c= 13.267(3) Å andZ= 2, finalR= 0.035 for 353 independent reflections. For Pb1.32V8.35O16.7, V(1) and V(2) octahedra form a hollandite-type framework. Pb(1) and Pb(2) alternate randomly with O(5) atoms in the hollandite-type tunnels which are fully occupied. The O(5) atoms create additional oxygen tetrahedra occupied by intratunnel V(3) atoms. The structure of PbV6O11is closely related to BaTi2Fe4O11andAV6O11compounds (A= Na, Sr) which adopt anR-type hexagonal ferrite structure: O and Pb atoms form a hexagonal close-packed structure, and V(1), V(2), and V(3) atoms are surrounded octahedrally by six oxygen atoms. V(2)O6and V(3)O6octahedra are face-shared and occupied by V3+and V4+ions, respectively, whereas they are equivalent in otherAV6O11compounds. The lack of symmetry due to the lone pair effect of the Pb2+ion is responsible for the split of these vanadium atoms. The Pb2+ion is displaced from the center of the cuboctahedron to a basal O3triangle and forms an umbrella-like PbO3entity. As a consequence, the V(4) atom is also off-centered in the trigonal-bipyramid and its environment is rather better described as a tetrahedron, like Fe3+in numerous magnetoplumbite-type compounds." @default.
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- W2007758601 date "1996-08-01" @default.
- W2007758601 modified "2023-09-25" @default.
- W2007758601 title "New Mixed Valence Compounds in the Pb–V–O System: Synthesis and Crystal Structure of Hollandite-Related Pb1.32V8.35O16.7andR-Type Hexagonal Ferrite PbV6O11" @default.
- W2007758601 doi "https://doi.org/10.1006/jssc.1996.0269" @default.
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