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Abriel, W.; du Bois, A.: Die Kristallstrukturen von Verbindungen des Typs A2TeX6 (A = K, NH4, Rb, Cs; X = Cl, Br, I). In: Zeitschrift für Naturforschung - Section B Journal of Chemical Sciences 44 (1989), Nr. 10, S. 1187-1194. DOI: https://doi.org/10.1515/znb-1989-1007
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Sum total of downloads: 242
| Abstract: | |
With the determination of the crystal structure of (NH4)2TeI6 the list of the descriptions of A2TeX6 structures is further completed. At 293 K three structure types are observed with an antifluorite packing of cations and anions: The cubic K2PtCl6 type structure (space group Fm 3̄ m, Z = 4), the tetragonal Rb2TeI6 type structure (space group P4/mnc, Z = 2), and the monoclinic K2TeBr6 type structure (space group P21/n, Z = 2). The latter type was found for (NH4)2TeI6 with a = 8.0694(7), b = 8.0926(9), c = 11.7498(8) Å and β = 89.605(8)° and refined to a final Rw of 0.065. From ionic radii ratios the symmetry of the A2MX6 type structures can be predicted including a prediction of low temperature instability (soft mode condensation). Group-subgroup relationships connect the corresponding space groups and the space groups of the high/low temperature polymorphs. | |
| License of this version: | CC BY-NC-ND 3.0 Unported |
| Document Type: | Article |
| Publishing status: | publishedVersion |
| Issue Date: | 1989 |
| Appears in Collections: | Naturwissenschaftliche Fakultät |
distribution of downloads over the selected time period:
downloads by country:
| pos. | country | downloads | ||
|---|---|---|---|---|
| total | perc. | |||
| 1 |  |
Germany | 161 | 66.53% |
| 2 |  |
United States | 16 | 6.61% |
| 3 |  |
China | 14 | 5.79% |
| 4 |  |
Russian Federation | 11 | 4.55% |
| 5 |  |
Czech Republic | 9 | 3.72% |
| 6 |  |
Austria | 6 | 2.48% |
| 7 |  |
Iran, Islamic Republic of | 5 | 2.07% |
| 8 |  |
United Kingdom | 5 | 2.07% |
| 9 |  |
Canada | 3 | 1.24% |
| 10 |  |
France | 2 | 0.83% |
| other countries | 10 | 4.13% | ||
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