| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1504695 | Solid State Sciences | 2013 | 6 Pages |
•We synthesized two new ternary iron arsenides.•Structure solution indicated relations to iron arsenide superconductors.•We characterized one title compound with electrical resistivity and magnetization measurements.
The new compound Zr2Fe12As7 was prepared from the elements at 1110 °C. Zr2Fe12As7 crystallizes in the hexagonal Zr2Fe12P7 structure type (space group P6¯, a = 952.10(7) pm, c = 373.24(2) pm, V = 293.01 · 106 pm³, R1 = 0.031, wR2 = 0.077) with one formula unit in the hexagonal unit cell. The structure can be viewed as formed by chemical twinning from slabs occurring in many superconducting alkali, alkaline-earth and rare-earth metal iron pnictides. Zr2Fe12As7 shows Curie-paramagnetism and a metal-like electrical conductivity. The formation and particularly crystal growth of an analogues Hf compound requires higher temperatures of 1350 °C, which additionally provoke partial substitution of Fe by Hf in Hf2+xFe12–yAs7 (x = 1.6(2), y = 3, space group P6¯, a = 951.1(1) pm, c = 370.39(3) pm, V = 290.17 · 106 pm³, R1 = 0.044, wR2 = 0.097).
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