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- W2949409323 abstract "Reported are the synthesis and the structural characterization of four new polar intermetallic phases, which exist only with mixed alkaline-earth and rare-earth metal cations in narrow homogeneity ranges. (Sr1–xCax)5In3Ge6 and (Eu1–xYbx)5In3Ge6 (x≈0.7) crystallize in the orthorhombic space group Pnma with two formula units per unit cell (own structure type, Pearson symbol oP56). The lattice parameters are as follows: a=13.109(3)–13.266(3) Å, b=4.4089(9)–4.4703(12) Å, and c=23.316(5)–23.557(6) Å. (Sr1–xCax)3In2Ge4 and (Sr1–xYbx)3In2Ge4 (x≈0.4–0.5) adopt another novel monoclinic structure-type (space group C2/m, Z=4, Pearson symbol mS36) with lattice parameters in the range a=19.978(2)–20.202(2) Å, b=4.5287(5)–4.5664(5) Å, c=10.3295(12)–10.3447(10) Å, and β=98.214(2)–98.470(2)°, depending on the metal cations and their ratio. The polyanionic sub-structures in both cases are based on chains of InGe4 corner-shared tetrahedra. The A5In3Ge6 structure (A=Sr/Ca or Sr/Yb) also features Ge4 tetramers, and isolated In atoms in nearly square-planar environment, while the A3In2Ge4 structure (A=Sr/Ca or Eu/Yb) contains zig-zag chains of In and Ge strings with intricate topology of cis- and trans-bonds. The experimental results have been complemented by tight-binding linear muffin-tin orbital (LMTO) band structure calculations." @default.
- W2949409323 created "2019-06-27" @default.
- W2949409323 creator A5058480849 @default.
- W2949409323 creator A5068479958 @default.
- W2949409323 date "2010-06-01" @default.
- W2949409323 modified "2023-10-18" @default.
- W2949409323 title "Synthesis and structural characterization of A3In2Ge4 and A5In3Ge6 (A=Ca, Sr, Eu, Yb)—New intermetallic compounds with complex structures, exhibiting Ge–Ge and In–In bonding" @default.
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- W2949409323 doi "https://doi.org/10.1016/j.jssc.2010.03.036" @default.
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