Ternary Laves phases Sc<sub>0.22(1)</sub>Ta<sub>0.78(1)</sub>Fe<sub>2</sub>and Sc<sub>0.63(1)</sub>In<sub>0.37(1)</sub>Co<sub>2</sub>– coloring variants of the MgZn<sub>2</sub>and MgNi<sub>2</sub>type
نویسندگان
چکیده
The ternary Laves phases Sc0.22(1)Ta0.78(1)Fe2 and Sc0.63(1)In0.37(1)Co2 were synthesized by arc-melting appropriate amounts of the binary ScFe2 TaFe2 or Sc, In Co, respectively. samples studied powder X-ray diffraction structures refined from single crystal data: P63/mmc, a=484.96(7), c=793.17(11) pm, wR2=0.0604, 147 F2 values, 12 variables for P63mc, a=488.61(4), c=1599.54(12) wR2=0.0389, 553 35 Sc0.63(1)In0.37(1)Co2. derives MgZn2 type having a mixed Sc/Ta occupancy on 4 f magnesium position. crystallizes with new structure which phase MgNi2. A translationengleiche symmetry reduction leads to non-centrosymmetric space group P63mc allows partial Sc/In ordering different ratios four crystallographically independent sites. While build complete solid solution Sc1–xTaxFe2 structure, we observe switch in Sc1–xInxCo2 cubic MgCu2 (x=0–0.22) derivative MgNi2 at x=0.37.
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ژورنال
عنوان ژورنال: Zeitschrift für anorganische und allgemeine Chemie
سال: 2021
ISSN: ['0044-2313', '1521-3749']
DOI: https://doi.org/10.1002/zaac.202000362