Yuan, Jia ; Hapis, Stefania ; Breitzke, Hergen ; Xu, Yeping ; Fasel, Claudia ; Kleebe, Hans-Joachim ; Buntkowsky, Gerd ; Riedel, Ralf ; Ionescu, Emanuel (2014)
Single-Source-Precursor Synthesis of Hafnium-Containing Ultrahigh-Temperature Ceramic Nanocomposites (UHTC-NCs).
In: Inorganic Chemistry, 53 (19)
doi: 10.1021/ic501512p
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Amorphous SiHfBCN ceramics were prepared from a commercial polysilazane (HTT 1800, AZ-EM), which was modified upon reactions with Hf(NEt2)4 and BH3·SMe2, and subsequently cross-linked and pyrolyzed. The prepared materials were investigated with respect to their chemical and phase composition, by means of spectroscopy techniques (Fourier transform infrared (FTIR), Raman, magic-angle spinning nuclear magnetic resonance (MAS NMR)), as well as X-ray diffraction (XRD) and transmission electron microscopy (TEM). Annealing experiments of the SiHfBCN samples in an inert gas atmosphere (Ar, N2) at temperatures in the range of 1300–1700 °C showed the conversion of the amorphous materials into nanostructured UHTC-NCs. Depending on the annealing atmosphere, HfC/HfB2/SiC (annealing in argon) and HfN/Si3N4/SiBCN (annealing in nitrogen) nanocomposites were obtained. The results emphasize that the conversion of the single-phase SiHfBCN into UHTC-NCs is thermodynamically controlled, thus allowing for a knowledge-based preparative path toward nanostructured ultrahigh-temperature stable materials with adjusted compositions.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2014 |
| Autor(en): | Yuan, Jia ; Hapis, Stefania ; Breitzke, Hergen ; Xu, Yeping ; Fasel, Claudia ; Kleebe, Hans-Joachim ; Buntkowsky, Gerd ; Riedel, Ralf ; Ionescu, Emanuel |
| Art des Eintrags: | Bibliographie |
| Titel: | Single-Source-Precursor Synthesis of Hafnium-Containing Ultrahigh-Temperature Ceramic Nanocomposites (UHTC-NCs) |
| Sprache: | Englisch |
| Publikationsjahr: | 6 Oktober 2014 |
| Verlag: | ACS Publications |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Inorganic Chemistry |
| Jahrgang/Volume einer Zeitschrift: | 53 |
| (Heft-)Nummer: | 19 |
| DOI: | 10.1021/ic501512p |
| Kurzbeschreibung (Abstract): | Amorphous SiHfBCN ceramics were prepared from a commercial polysilazane (HTT 1800, AZ-EM), which was modified upon reactions with Hf(NEt2)4 and BH3·SMe2, and subsequently cross-linked and pyrolyzed. The prepared materials were investigated with respect to their chemical and phase composition, by means of spectroscopy techniques (Fourier transform infrared (FTIR), Raman, magic-angle spinning nuclear magnetic resonance (MAS NMR)), as well as X-ray diffraction (XRD) and transmission electron microscopy (TEM). Annealing experiments of the SiHfBCN samples in an inert gas atmosphere (Ar, N2) at temperatures in the range of 1300–1700 °C showed the conversion of the amorphous materials into nanostructured UHTC-NCs. Depending on the annealing atmosphere, HfC/HfB2/SiC (annealing in argon) and HfN/Si3N4/SiBCN (annealing in nitrogen) nanocomposites were obtained. The results emphasize that the conversion of the single-phase SiHfBCN into UHTC-NCs is thermodynamically controlled, thus allowing for a knowledge-based preparative path toward nanostructured ultrahigh-temperature stable materials with adjusted compositions. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe |
| Hinterlegungsdatum: | 06 Nov 2014 13:27 |
| Letzte Änderung: | 18 Aug 2021 11:30 |
| PPN: | |
| Sponsoren: | .Y. acknowledges fi nancial support from China Scholarship Council (CSC) during his stay at TU Darmstadt., Furthermore, fi nancial support from the European Research Agency (FP7 FUNEA Functional Nitrides for Energy Applications) and the Deutsche Forschungsgemeinschaft (DFG, No. SFB595) is gratefully acknowledged. |
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