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The title compounds have been prepared by arc-melting cold-pressed pellets of the elemental components. They crystallize with a new structure type, which was determined from singlecrystal X-ray diffractometer data of Th 2 NiB 10 : Pbam, a = 564.6(2) pm, b = 1120.4(3) pm, c = 417.3(1) pm, Z = 2, R = 0.020 for 748 structure factors and 25 variable parameters. The structures of Th 2 FeB 10  (a = 562.7(1) pm, b = 1126.1(3) pm, c = 418.3(2) pm) and Th 2 CoB 10  (a = 562.4(1) pm, b = 1122.8(2) pm, c = 418.5(1) pm) were refined from single-crystal data to residuals of 0.025 (921 F values) and 0.032 (911 F values). The lattice of these ternary borides may be derived from that of ThB 6  (Th 2 B 12 ) with the cubic CaB 6  type structure by replacing two of the linking boron atoms of adjacent B 6  octahedra by a transition metal atom.

The Thorium Transition Metal Borides Th 2 TB 10 (T = Fe, Co, Ni) with a Structure Very Similar to that of CaB 6