Umićević, Ana B. ; Cekić, Božidar Đ. ; Belošević-Čavor, Jelena N. ; Koteski, Vasil J. ; Papendorf, Benjamin ; Riedel, Ralf ; Ionescu, Emanuel (2015)
Evolution of the local structure at Hf sites in SiHfOC upon ceramization of a hafnium-alkoxide-modified polysilsesquioxane: A perturbed angular correlation study.
In: Journal of the European Ceramic Society, 35 (1)
doi: 10.1016/j.jeurceramsoc.2014.08.023
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The evolution of the environment of Hf sites in a hafnium-alkoxide-modified polysilsesquioxane upon polymer-to-ceramic transformation was investigated via the perturbed angular correlation (PAC) method. The results of the PAC measurements on samples thermally treated at temperatures from 400 to 1300 °C indicate that Hf is surrounded only by oxygen at all studied temperatures. This finding is in agreement with the evolution pathway of polymer-derived SiHfOC ceramics, which were reported to be generated as single-phase amorphous materials upon pyrolysis of alkoxide-modified polysiloxanes and subsequently to phase separate and crystallize towards HfO2/SiOC nanocomposites. Thus, the results presented here support our previous statement that there is a thermodynamic control on the phase separation and crystallization behavior of Sisingle bondMsingle bondOsingle bondC (M = metal) ceramics (Ionescu et al. 96;2013:1899–1903), which in the case of Hf leads to the precipitation and crystallization of hafnia nanoparticles within a SiOC matrix.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2015 |
| Autor(en): | Umićević, Ana B. ; Cekić, Božidar Đ. ; Belošević-Čavor, Jelena N. ; Koteski, Vasil J. ; Papendorf, Benjamin ; Riedel, Ralf ; Ionescu, Emanuel |
| Art des Eintrags: | Bibliographie |
| Titel: | Evolution of the local structure at Hf sites in SiHfOC upon ceramization of a hafnium-alkoxide-modified polysilsesquioxane: A perturbed angular correlation study |
| Sprache: | Englisch |
| Publikationsjahr: | Januar 2015 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 35 |
| (Heft-)Nummer: | 1 |
| DOI: | 10.1016/j.jeurceramsoc.2014.08.023 |
| Kurzbeschreibung (Abstract): | The evolution of the environment of Hf sites in a hafnium-alkoxide-modified polysilsesquioxane upon polymer-to-ceramic transformation was investigated via the perturbed angular correlation (PAC) method. The results of the PAC measurements on samples thermally treated at temperatures from 400 to 1300 °C indicate that Hf is surrounded only by oxygen at all studied temperatures. This finding is in agreement with the evolution pathway of polymer-derived SiHfOC ceramics, which were reported to be generated as single-phase amorphous materials upon pyrolysis of alkoxide-modified polysiloxanes and subsequently to phase separate and crystallize towards HfO2/SiOC nanocomposites. Thus, the results presented here support our previous statement that there is a thermodynamic control on the phase separation and crystallization behavior of Sisingle bondMsingle bondOsingle bondC (M = metal) ceramics (Ionescu et al. 96;2013:1899–1903), which in the case of Hf leads to the precipitation and crystallization of hafnia nanoparticles within a SiOC matrix. |
| Freie Schlagworte: | Polymer-derived ceramics (PDCs), Perturbed angular correlation (PAC); HfO2/SiOC nanocomposites, Polymer-to-ceramic transformation, Nanostructure evolution |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 06 Nov 2014 13:17 |
| Letzte Änderung: | 06 Nov 2014 13:17 |
| PPN: | |
| Sponsoren: | The Ministry of Education, Science and Technological Development of the Republic of Serbia (Project no. 171001) provided the financial support for this study through the project no. 171001., EI and RR thank to the German Science Foundation (DFG) (DFG: IO 64/7-1) for financial support. |
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