Ionescu, Emanuel ; Papendorf, Benjamin ; Kleebe, Hans-Joachim ; Breitzke, Hergen ; Nonnenmacher, Katharina ; Buntkowsky, Gerd ; Riedel, Ralf (2012)
Phase separation of a hafnium alkoxide-modified polysilazane upon polymer-to-ceramic transformation - A case study.
In: Journal of the European Ceramic Society, 32 (9)
doi: 10.1016/j.jeurceramsoc.2011.09.003
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The polymer-to-ceramic transformation of a hafnium alkoxide-modified polysilazane was investigated via thermogravimetric analysis coupled with in situ mass spectrometry (TG/MS), nuclear magnetic resonance (MAS NMR) and transmission electron microscopy (TEM). The results indicate that the structural evolution of the polysilazane upon ceramization is strongly affected by the modification with hafnium alkoxide. Thus, the content of carbon in the ceramic backbone was relatively low, whereas a large amount of SiN4 sites and a segregated carbon phase was present in the sample. Furthermore, this study revealed the formation of a SiHfCNO amorphous single phase ceramic via pyrolysis of the polymer at 700 degrees C whereas at higher pyrolysis temperatures precipitation of hafnia was observed, leading to an amorphous hafnia/silicon carbonitride ceramic nanocomposite. The precipitation of hafnia was shown to not rely on decomposition processes, but to be a result of rearrangement reactions occurring within the ceramic material. (C) 2011 Elsevier Ltd. All rights reserved.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2012 |
| Autor(en): | Ionescu, Emanuel ; Papendorf, Benjamin ; Kleebe, Hans-Joachim ; Breitzke, Hergen ; Nonnenmacher, Katharina ; Buntkowsky, Gerd ; Riedel, Ralf |
| Art des Eintrags: | Bibliographie |
| Titel: | Phase separation of a hafnium alkoxide-modified polysilazane upon polymer-to-ceramic transformation - A case study |
| Sprache: | Englisch |
| Publikationsjahr: | 2012 |
| Verlag: | Elsevier |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 32 |
| (Heft-)Nummer: | 9 |
| DOI: | 10.1016/j.jeurceramsoc.2011.09.003 |
| URL / URN: | https://www.sciencedirect.com/science/article/pii/S095522191... |
| Kurzbeschreibung (Abstract): | The polymer-to-ceramic transformation of a hafnium alkoxide-modified polysilazane was investigated via thermogravimetric analysis coupled with in situ mass spectrometry (TG/MS), nuclear magnetic resonance (MAS NMR) and transmission electron microscopy (TEM). The results indicate that the structural evolution of the polysilazane upon ceramization is strongly affected by the modification with hafnium alkoxide. Thus, the content of carbon in the ceramic backbone was relatively low, whereas a large amount of SiN4 sites and a segregated carbon phase was present in the sample. Furthermore, this study revealed the formation of a SiHfCNO amorphous single phase ceramic via pyrolysis of the polymer at 700 degrees C whereas at higher pyrolysis temperatures precipitation of hafnia was observed, leading to an amorphous hafnia/silicon carbonitride ceramic nanocomposite. The precipitation of hafnia was shown to not rely on decomposition processes, but to be a result of rearrangement reactions occurring within the ceramic material. (C) 2011 Elsevier Ltd. All rights reserved. |
| Freie Schlagworte: | Precursors, polymer-derived ceramics (pdcs), nanocomposites, transition metal oxides, c-n ceramics, solid-state nmr amorphous-silicon carbonitride molecular-dynamics atomic-structure x-ray crystallization precursors microstructure diffraction |
| Zusätzliche Informationen: | Sp. Iss. SI 936YP Times Cited:5 Cited References Count:35 |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Geomaterialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Physikalische Chemie |
| Hinterlegungsdatum: | 27 Okt 2014 20:43 |
| Letzte Änderung: | 24 Sep 2021 06:34 |
| PPN: | |
| Sponsoren: | German Research Fundation (DFG) within the Priority Programme SPP1181 NANOMAT (IO64/1–2), Ministry of Higher Education, Research and the Arts in Hesse, Germany (AdRIA: Adaptronik – Research, Innovation, Application), Fonds der Chemischen Industrie for continuous financial support |
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