Zur Kenntnis neuer supraleitender Einlagerungsverbindungen von organischen Fünfring-Heterocyclen in 2H-Tantaldisulfid / New Superconducting Intercalation Compounds of Organic Five-Membered Heterocyclic Compounds with 2 Η-Tantalum Disulfide
| Autor: | Peter Remmert, Richard Fackler, Hans-Ulrich Hummel |
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| Rok vydání: | 1992 |
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| Zdroj: | Zeitschrift für Naturforschung B. 47:741-747 |
| ISSN: | 1865-7117 0932-0776 |
| DOI: | 10.1515/znb-1992-0522 |
| Popis: | The intercalation compounds TaS2(pyrrole)0.5 (1), TaS2(2-methylpyrrole)0.33 (2), TaS2(2,5-dimethylpyrrole) (3), TaS2(thiazole)0.33 (4) and TaS2(imidazole)0.33 (5) are formed readily in closed systems at temperatures up to 200°C. Furane and thiophene show no tendency to intercalate in 2H–TaS2. Compounds 2-5 are molecular intercalation species, and deintercalation is finished at 350°C, while in 1 the pyrrole guests have been associated and thermally induced deintercalation proceeds up to 900°C with fragmentation. 1-5 can be indexed on the basis of hexagonal symmetry assuming the space group P63/mmc. In 1 the stacking sequence of the host lattice TaS2 remains unchanged while in 2, 3 and 5 a transformation from the BaB CaC stacking of 2H –TaS2 to a sequence AbA AcA occurs. In 4 a stacking CbC BcB like in MoS2 is realized. 1-5 show superconducting behaviour at low temperatures, 2 exhibits a pronounced metall-semiconductor transition at 220 K. |
| Databáze: | OpenAIRE |
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