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- Title
Synthesis and Structural Characterization of ACu<sub>9</sub> Tt<sub>4</sub> ( A = Ca, Sr, Ba, Eu; Tt = Si, Ge, Sn) - Tetragonally Distorted Ternary Variants of the Cubic NaZn<sub>13</sub> Structure Type. Improved Structure Refinement of SrCu<sub>2</sub>Ge<sub>2</sub>
- Authors
Schäfer, Marion C.; Yamasaki, Yuki; Fritsch, Veronika; Bobev, Svilen
- Abstract
Investigations in the Cu-rich parts of the ternary systems A-Cu- Tt ( A = Ca, Sr, Ba, Eu, Yb; Tt = Si, Ge, Sn) were carried out using the molten flux method. The results indicate that using tin as a flux, several stannides with a general formula ACu9Sn4 ( A = Ca, Sr, Ba, and Eu) can be readily synthesized. Their structures (space group I4/ mcm, Pearson symbol tI56) are ordered ternary variants of the cubic NaZn13 structure type. In the corresponding germanium and silicon systems, only the solid solutions BaCu9- xGe4+ x and BaCu9- xSi4+ x ( x ≈ 0.5) can be obtained from eutectic Cu: Tt mixtures with compositions approximately 2:1. Their structures are formally isotypic with the CeNi8.5Si4.5 structure type, a partially ordered variant of the same NaZn13 structure. In the remaining systems A-Cu- Tt ( A = Ca, Sr, Eu, Yb; Tt = Si, Ge), the known ACu2 Tt2 phases (space group I4/ mmm, Pearson symbol tI10) with the ThCr2Si2 structure type were found to be the most frequently observed products. In this article we discuss the subtleties of each structure with regard to the synthetic route; the similarities and the differences in the syntheses, and the structure refinements among the studied compounds are compared and contrasted. The structure of SrCu2Ge2 was also re-assessed.
- Publication
Zeitschrift für Anorganische und Allgemeine Chemie, 2012, Vol 638, Issue 7/8, p1204
- ISSN
0044-2313
- Publication type
Article
- DOI
10.1002/zaac.201200062