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- W1971601753 abstract "The crystal structure of the mixed-valence barium niobium(IV/V) oxosilicate, Ba6Nb14Si4O47, has been determined by single crystal X-ray diffraction. The title compound crystallizes in the hexagonal crystal system with the space groupP63cm (No. 185) andZ = 2. The lattice parameters area = 9.022(2)A˚,c = 27.890(6)A˚, andV = 1966(1)A˚3. The structure can be described as the intergrowth of two structure types, barium niobium oxosilicate and barium niobium oxide, which form the series (Ba3Nb6Si4O26)n (Ba3Nb8O21). Ba6Nb14Si4O47 corresponds to the first member of the series,n = 1. The unit cell consists of columns of ReO3-type quasi-one-dimensional, fused NbO6 octahedra. The parallel octahedral columns are interconnected through shared corner oxygen atoms with isolated NbO6 octahedra and Si2O7 pyrosilicate units. The framework is closely related to that of theBa6+xNb14Si4O47(x = 0.23) phase, reported by Evans and Katz in 1973 (l), yet the title compound is stoichiometric and has an acentric unit cell. A detailed structure analysis and structure comparison with the nonstoichiometric phase, as well as a brief comparison with the fully oxidized compound Ba6Nb10Ti4Si4O47, are presented." @default.
- W1971601753 created "2016-06-24" @default.
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- W1971601753 date "1992-11-01" @default.
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- W1971601753 title "Synthesis and structural characterization of Ba6Nb14Si4O47. The first member of the new barium niobium(IV/V) oxosilicate series(Ba3Nb6Si4O26)n(Ba3Nb8O21), n = 1" @default.
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- W1971601753 doi "https://doi.org/10.1016/0022-4596(92)90197-4" @default.
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