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http://dx.doi.org/10.18419/opus-12307
Autor(en): | Stelzer, Robert U. Ikeda, Yuji Srinivasan, Prashanth Lehmann, Tanja S. Grabowski, Blazej Niewa, Rainer |
Titel: | Li5Sn, the most lithium-rich binary stannide : a combined experimental and computational study |
Erscheinungsdatum: | 2022 |
Dokumentart: | Zeitschriftenartikel |
Seiten: | 7096-7110 |
Erschienen in: | Journal of the American Chemical Society 144 (2022), S. 7096-7110 |
URI: | http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-123245 http://elib.uni-stuttgart.de/handle/11682/12324 http://dx.doi.org/10.18419/opus-12307 |
ISSN: | 1520-5126 0002-7863 |
Zusammenfassung: | From reaction of excess lithium with tin, we isolate well-crystallized Li5Sn and solve the crystal structure from single-crystal X-ray diffraction data. The orthorhombic structure (space group Cmcm) features the same coordination polyhedra around tin and lithium as previously predicted by electronic structure calculations for this composition, however differently arranged. An extensive ab initio analysis, including thermodynamic integration using Langevin dynamics in combination with a machine-learning potential (moment tensor potential), is conducted to understand the thermodynamic stability of this Cmcm Li5Sn structure observed in our experiments. Among the 108 Li5Sn structures systematically derived using the structure enumeration algorithm, including the experimental Cmcm structure and those obtained in previous ab initio studies, another new structure with the space group Immm is found to be energetically most stable at 0 K. This computationally discovered Immm structure is also found to be thermodynamically more stable than the Cmcm structure at finite temperatures, indicating that the Cmcm Li5Sn structure observed in our experiments is favored likely due to kinetic reasons rather than thermodynamics. |
Enthalten in den Sammlungen: | 03 Fakultät Chemie |
Dateien zu dieser Ressource:
Datei | Beschreibung | Größe | Format | |
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Li5Sn.pdf | 5,34 MB | Adobe PDF | Öffnen/Anzeigen |
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