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- W2078481503 abstract "BaNb8O14 has been prepared by heating a pellet of BaNb2O6, NbO, NbO2 and B2O3 (as mineralizer) at 1000 °C. It crystallizes in two modifications: (I) in Pbam with a = 931.1(2) pm, b = 1033.1(5) pm, c = 595.4(3) pm and Z = 2, which is isotypic with SrNb8O14, and (II) in Cmca with a = 2380(1) pm, b = 1033(1) pm, c = 932.5(5) pm and Z = 8. The a-axis of (II) is four times larger than the c-axis of (I) and the other axes are of comparable size. For macrocrystalline products the Guinier diagram shows lines for both modifications, whereas for microcrystalline powders only (I) is observed. Characteristic building units of (I) and (II) are metal-metal bonded Nb6O12 clusters, NbO6 octahedra (Nb5+) and BaO12 units which are distorted cuboctahedra. The clusters contain 14 electrons in metal-metal bonding states. (I) and (II) differ only in the packing of the units. Their structural relationship and the nature of the disordered modification of BaNb8O14 (II) are discussed." @default.
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- W2078481503 date "1989-10-01" @default.
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- W2078481503 title "The characterization by analytical electron microscopy and single crystal X-ray diffraction of BaNb8O14, a metal oxide containing octahedral Nb6O12 clusters" @default.
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- W2078481503 doi "https://doi.org/10.1016/0022-5088(89)90213-0" @default.
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