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- W2044331983 abstract "The new compounds LiPt3B (hexagonal, P6̄2m, a = 9.236(1) Å, c = 2.768(1) Å, Z = 3), NaPt3B1+x (0⩽ x ⩽0.45) (hexagonal, P6/mmm, a = 5.547(1) Å, c = 5.504(1) Å for x = 0, Z = 2) and Na3Pt9B5 (orthorhombic, Cmcm, a = 5.539(1) Å, b = 11.401(1) Å, c = 15.047(1) Å, Z = 4) were prepared by reaction of the elements in sealed tantalum tubes at 1000 °C. The structures were determined using single-crystal X-ray methods. Three new structure variants of the CeCo3B2-type structure are formed, owing to the boron deficiency of these compounds compared with CeCo3B2. In NaPt3B1.0 only every second layer of the trigonal platinum prisms is occupied by boron, whereas the prisms of LiPt3B are shifted against each other, thus generating new smaller platinum polyhedra which are unable to accommodate boron atoms. The structure of Na3Pt9B5 can be derived from the CeCo3B2 type by chemical twinning. As a reason for the boron deficiency, a minimum value of 0.6 alkali metal valence electrons per boron atom in the CeCo3B2-derived structures is assumed." @default.
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- W2044331983 date "1988-11-01" @default.
- W2044331983 modified "2023-09-23" @default.
- W2044331983 title "The ternary alkali metal platinum borides LiPt3B, NaPt3B1+x and Na3Pt9B5 — new structure variants of the CeCo3B2 type" @default.
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- W2044331983 doi "https://doi.org/10.1016/0022-5088(88)90352-9" @default.
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