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Synthesis of polymeric precursors for the formation of nanocrystalline Ti-C-N/amorphous Si-C-N composites

Hering, Nicole ; Schreiber, K. ; Riedel, R. ; Lichtenberger, O. ; Woltersdorf, J. :
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.
[Artikel], (2001)

Kurzbeschreibung (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.

Typ des Eintrags: Artikel
Erschienen: 2001
Autor(en): Hering, Nicole ; Schreiber, K. ; Riedel, R. ; Lichtenberger, O. ; Woltersdorf, J.
Titel: Synthesis of polymeric precursors for the formation of nanocrystalline Ti-C-N/amorphous Si-C-N composites
Sprache: Englisch
Kurzbeschreibung (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.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Applied organometallic chemistry
Band: 15
(Heft-)Nummer: 10
Verlag: Wiley
Freie Schlagworte: ceramic materials, pyrolysis, titanium, carbodiimides, vibrational spectroscopy, thermal gravimetric analysis
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Disperse Feststoffe, Dispersive Solids
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 19 Nov 2008 16:23
Sponsoren: Contract/grant sponsor: Deutsche Forschungsgemeinschaft and Fonds der Chemischen Industrie.
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