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- W4253356160 abstract "The crystal structure of two compounds having the generic formula Ln4−xA4+xCo2+yAl2−yO15 has been determined. Nd3.43Ba4.42(1)Co(Co1.23(6)Al1.77)O15 (compound I), Mr = 1520.96, hexagonal, P63mc, a = 11.544(1) Å, c = 6.912(1) Å, V = 797.7(2) Å3, Z = 2, Dx = 6.33 g cm−3, MoKα λ = 0.71069 Å, μ1 = 242.0 cm−1; R = 0.045 for 758 reflections >5σ(F). Y2Sr6Co(Co1.08(6)Al1.92)O15 (compound II), Mr = 1118.00, hexagonal, P63mc, a = 11.199(2) Å, c = 6.664(1) Å, V = 723.8(4) Å3, Z = 2, Dx = 5.13 g cm−3, MoKα λ = 0.71069 Å, μ1 = 317.5 cm−1; R = 0.076 for 373 reflections >6σ(F). The structure consists of clusters formed by a Co-oxygen octahedron that shares three corners of a triangular face with three separate CoAl-oxygen tetrahedra leading to a cluster formula [CoVI(CoAl)IV3]O15. The tetrahedral interstice is randomly occupied by Co3+ and Al3+ ions. The octahedral interstice is occupied by Co whose valence is 2+ in compound I and 3 + in II. Two such clusters exist in the unit cell and they are joined by rare earth-alkaline earth cations in 6-fold (octahedral), 8-fold (bisdisphenoid), 10-fold (capped trigonal prism), and 12-fold (cubic close packed) coordination to the oxygen ions. The octahedral cation positions are randomly occupied by about equal amounts of NdBa and YSr, respectively. Phase I forms with Pr and Gd but not with La, Y, or Er, restricting its formation to lanthanide ionic radii between 1.14 and 1.06 Å." @default.
- W4253356160 created "2022-05-12" @default.
- W4253356160 date "1910-08-01" @default.
- W4253356160 modified "2023-09-30" @default.
- W4253356160 title "Increasing the sensitiveness to light of asphaltum" @default.
- W4253356160 doi "https://doi.org/10.1016/s0016-0032(10)91131-9" @default.
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