Gao, Yan ; Widgeon, Scarlett J. ; Tran, Tien B. ; Tavakoli, Amir Hossein ; Mera, Gabriela ; Sen, Sabyasachi ; Riedel, Ralf ; Navrotsky, Alexandra (2013)
Effect of demixing and coarsening on the energetics of poly(boro)silazane-derived amorphous Si–(B–)C–N ceramics.
In: Scripta Materialia, 69 (5)
doi: 10.1016/j.scriptamat.2013.04.022
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Novel poly(boro)silazane-derived Si–(B–)C–N ceramics pyrolyzed at 1100 and 1400 °C were analyzed by multinuclear magic-angle spinning nuclear magnetic resonance spectroscopy and high-temperature oxidative solution calorimetry to investigate the energetic effects of nanodomain structure evolution at two critical pyrolysis temperatures. Like other Si–B–C–N ceramics, increasing pyrolysis temperatures result in the demixing of SiCxN4−x mixed bond environments into SiC4 and SiN4 tetrahedra, interdomain bond cleavage and nanodomain coarsening. Concurrent demixing and domain coarsening, processes detrimental to these ceramics, were found to be energetically stabilizing.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2013 |
| Autor(en): | Gao, Yan ; Widgeon, Scarlett J. ; Tran, Tien B. ; Tavakoli, Amir Hossein ; Mera, Gabriela ; Sen, Sabyasachi ; Riedel, Ralf ; Navrotsky, Alexandra |
| Art des Eintrags: | Bibliographie |
| Titel: | Effect of demixing and coarsening on the energetics of poly(boro)silazane-derived amorphous Si–(B–)C–N ceramics |
| Sprache: | Englisch |
| Publikationsjahr: | September 2013 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Scripta Materialia |
| Jahrgang/Volume einer Zeitschrift: | 69 |
| (Heft-)Nummer: | 5 |
| DOI: | 10.1016/j.scriptamat.2013.04.022 |
| Kurzbeschreibung (Abstract): | Novel poly(boro)silazane-derived Si–(B–)C–N ceramics pyrolyzed at 1100 and 1400 °C were analyzed by multinuclear magic-angle spinning nuclear magnetic resonance spectroscopy and high-temperature oxidative solution calorimetry to investigate the energetic effects of nanodomain structure evolution at two critical pyrolysis temperatures. Like other Si–B–C–N ceramics, increasing pyrolysis temperatures result in the demixing of SiCxN4−x mixed bond environments into SiC4 and SiN4 tetrahedra, interdomain bond cleavage and nanodomain coarsening. Concurrent demixing and domain coarsening, processes detrimental to these ceramics, were found to be energetically stabilizing. |
| Freie Schlagworte: | Polymer-derived ceramics, Nuclear magnetic resonance (NMR), Thermodynamics, Amorphous materials, Nanostructure |
| 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: | 19 Feb 2014 13:31 |
| Letzte Änderung: | 19 Feb 2014 13:31 |
| PPN: | |
| Sponsoren: | This study was supported by the National Science Foundation-Deutsche Forschungsgemeinschaft (NSF-DFG) Materials World Network (MWN-0907792) under the collaborative project, “Nanostructure and thermodynamics of polymer-derived ceramics”. |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum