Hering, Nicole ; Schreiber, K. ; Riedel, R. ; Lichtenberger, O. ; Woltersdorf, J. (2001):
Synthesis of polymeric precursors for the formation of nanocrystalline Ti-C-N/amorphous Si-C-N composites.
In: Applied Organometallic Chemistry, 15 (10), pp. 879-886. Wiley, ISSN 0268-2605,
[Article]
Abstract
The synthesis of trimethylsilyl-substituted poly(titaniumcarbodiimide) as a novel precursor for titanium carbonitride based ceramic materials is described. The precursor and the subsequent processing steps (cross-linking and pyrolysis) are characterized by IR and Raman spectroscopy, thermal gravimetric analysis and simultaneous mass spectroscopy, electron microscopy and powder X-ray diffraction measurements. The novel polymer is formed by the reaction of TiCl4 or Ti(NEt2)4 with bis(trimethylsilyl) carbodiimide. Subsequent pyrolysis at 1000 °C in argon results in the formation of a ceramic composite material consisting of nanocrystalline TiCN and amorphous SiCN as constituting phases. Using Ti(NEt2)4 as a starting reagent instead of TiCl4, chlorine contamination of the ceramic material can be avoided. The different molecular vibration modes of the metal–nitrogen, metal–carbon and nitrogen– carbon bonds in poly(titaniumcarbodiimides) with trimethylsilyl substituents were calculated using quantum mechanical methods, providing a comprehensive understanding of the measured spectra.
| Item Type: | Article |
|---|---|
| Erschienen: | 2001 |
| Creators: | Hering, Nicole ; Schreiber, K. ; Riedel, R. ; Lichtenberger, O. ; Woltersdorf, J. |
| Title: | Synthesis of polymeric precursors for the formation of nanocrystalline Ti-C-N/amorphous Si-C-N composites |
| Language: | English |
| Abstract: | The synthesis of trimethylsilyl-substituted poly(titaniumcarbodiimide) as a novel precursor for titanium carbonitride based ceramic materials is described. The precursor and the subsequent processing steps (cross-linking and pyrolysis) are characterized by IR and Raman spectroscopy, thermal gravimetric analysis and simultaneous mass spectroscopy, electron microscopy and powder X-ray diffraction measurements. The novel polymer is formed by the reaction of TiCl4 or Ti(NEt2)4 with bis(trimethylsilyl) carbodiimide. Subsequent pyrolysis at 1000 °C in argon results in the formation of a ceramic composite material consisting of nanocrystalline TiCN and amorphous SiCN as constituting phases. Using Ti(NEt2)4 as a starting reagent instead of TiCl4, chlorine contamination of the ceramic material can be avoided. The different molecular vibration modes of the metal–nitrogen, metal–carbon and nitrogen– carbon bonds in poly(titaniumcarbodiimides) with trimethylsilyl substituents were calculated using quantum mechanical methods, providing a comprehensive understanding of the measured spectra. |
| Journal or Publication Title: | Applied Organometallic Chemistry |
| Volume of the journal: | 15 |
| Issue Number: | 10 |
| Publisher: | Wiley |
| Uncontrolled Keywords: | ceramic materials, pyrolysis, titanium, carbodiimides, vibrational spectroscopy, thermal gravimetric analysis |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids |
| Date Deposited: | 19 Nov 2008 16:23 |
| PPN: | |
| Corresponding Links: | |
| Funders: | Contract/grant sponsor: Deutsche Forschungsgemeinschaft and Fonds der Chemischen Industrie. |
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