Awin, Eranezhuth Wasan ; Papakollu, Kousik ; Vayyala, Ashok ; Yang, Tingting ; Mayer, Joachim ; Riedel, Ralf ; Kumar, Ravi ; Ionescu, Emanuel (2024)
Tailoring crystal structure of high-entropy carbides in Si-based ceramic nanocomposites through precursor engineering.
In: Journal of the European Ceramic Society, 44 (12)
doi: 10.1016/j.jeurceramsoc.2024.05.013
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
High-entropy carbides with tunable crystallization and growth have been demonstrated using single-source precursor derived ceramic route. The in situ nanocrystallization of high-entropy carbide phases, (Ta0.2W0.2V0.2Mo0.2Nb0.2)SiδC and (Ta0.167W0.167V0.167Mo0.167Nb0.167Si0.167)C in amorphous Si-based ceramic matrices was achieved by using polysiloxanes and polycarbosilanes as polymer precursors respectively. The results exemplify a prominent role of the architectures of the polymeric precursors in controlling the structural features of these ceramics at various length scales. In particular, it was observed that high-entropy carbides with rock salt and zinc blende crystal structures were formed when polysiloxanes and polycarbosilanes with different backbone structure were used as polymeric precursors respectively. This is attributed to the thermodynamics of nucleation of the carbidic phases in these nanocomposites. Furthermore, the precursor architecture that dictates free carbon content, influenced nanostructural features and porosity in the material. Therefore, engineering such compositionally complex phases is feasible by selecting suitable polymeric precursors.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Awin, Eranezhuth Wasan ; Papakollu, Kousik ; Vayyala, Ashok ; Yang, Tingting ; Mayer, Joachim ; Riedel, Ralf ; Kumar, Ravi ; Ionescu, Emanuel |
| Art des Eintrags: | Bibliographie |
| Titel: | Tailoring crystal structure of high-entropy carbides in Si-based ceramic nanocomposites through precursor engineering |
| Sprache: | Englisch |
| Publikationsjahr: | September 2024 |
| Verlag: | Elsevier |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 44 |
| (Heft-)Nummer: | 12 |
| DOI: | 10.1016/j.jeurceramsoc.2024.05.013 |
| Kurzbeschreibung (Abstract): | High-entropy carbides with tunable crystallization and growth have been demonstrated using single-source precursor derived ceramic route. The in situ nanocrystallization of high-entropy carbide phases, (Ta0.2W0.2V0.2Mo0.2Nb0.2)SiδC and (Ta0.167W0.167V0.167Mo0.167Nb0.167Si0.167)C in amorphous Si-based ceramic matrices was achieved by using polysiloxanes and polycarbosilanes as polymer precursors respectively. The results exemplify a prominent role of the architectures of the polymeric precursors in controlling the structural features of these ceramics at various length scales. In particular, it was observed that high-entropy carbides with rock salt and zinc blende crystal structures were formed when polysiloxanes and polycarbosilanes with different backbone structure were used as polymeric precursors respectively. This is attributed to the thermodynamics of nucleation of the carbidic phases in these nanocomposites. Furthermore, the precursor architecture that dictates free carbon content, influenced nanostructural features and porosity in the material. Therefore, engineering such compositionally complex phases is feasible by selecting suitable polymeric precursors. |
| Freie Schlagworte: | high-entropy carbide, single-source precursor, free carbon, porosity, nucleation |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Werkstofftechnik und Ressourcenmanagement |
| Hinterlegungsdatum: | 13 Jan 2025 09:50 |
| Letzte Änderung: | 13 Jan 2025 13:28 |
| PPN: | 525288384 |
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