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- W2021024196 abstract "The crystal structure of Sc2Ru5B4 has been determined by single-crystal X-ray analysis. Sc2Ru5B4 crystallizes in the primitive monoclinic space group P2m with a = 9.983(6), b = 8.486(4), c = 3.0001(3)Å, γ = 90.01(7)°, Z = 2. Deviations from the orthorhombic space group Pbam-D92h are small but significant. Intensity measurements were obtained from a four-circle diffractometer. The structure was solved by Patterson methods and refined by full matrix least-squares calculation. R = ∑|ΔF|∑|F0| = 0.036 for an asymmetric set of 863 independent reflections (|F0|>2σ(F0)). The crystal structure is characterized by two different types of boron atoms: (a) isolated borons B(1) and B(3) in distorted trigonal Ru-prisms with tetrakaidekahedral metal coordination: 6Ru + 3Sc, and (b) boron atoms B(2) and B(4) with a pronounced tendency to form boron pairs (B(2)-B(2) = 1.86 Å, B(4)-B(4) = 1.89 Å); the metal coordination of these boron atoms is 6Ru + 2Sc. Sc atoms have a coordination number of 17 consisting of 10Ru + 2Sc + 5B. The crystal structure of Sc2Ru5B4 is a pentagon layer structure (Ru, B atoms) with a 4.3.4.32-secondary layer of Sc atoms. The structure is furthermore related to the structure types of Ti3Co5B2 and CeCo3B2. From powder photographs Sc2Os5B4 is isotypic. No superconductivity was observed for Sc2(Ru, Os)5B4 down to 1.5 K." @default.
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- W2021024196 date "1984-12-01" @default.
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- W2021024196 title "The crystal structure of Sc2Ru5B4" @default.
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- W2021024196 doi "https://doi.org/10.1016/0022-4596(84)90276-7" @default.
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