Preparation and Crystal Structure of the Ternary Lanthanoid Nickel Arsenides Ln13Ni25As19 (Ln = Tm,Yb, and Lu) |
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Authors: | Wolfgang Jeitschko,Ludger J. Terbü chte,Ute Ch. Rodewald |
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Abstract: | The title compounds were prepared by reaction of the elemental components at high temperatures. They crystallize with a new structure type which was determined from single‐crystal X‐ray data of Tm13Ni25As19: P 6, a = 1621.9(4) pm, c = 387.78(8) pm, Z = 1, R = 0.025 for 3164 structure factors and 119 variable parameters. The refinement of the occupancy parameters suggested a mixed Tm/Ni occupancy for one metal position and defects for one nickel site resulting in the composition Tm12.57(1)Ni25.22(2)As19. These arsenides belong to a large structural family with a metal to metalloid ratio of 2 : 1. |
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Keywords: | Crystal structure Rare earth compounds Arsenides |
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