Synthesis and characterization of new amorphous Si/B/N/C ceramics with 
increased carbon content through single-source precursors

Jäschke, T.; Jansen, M.

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Synthesis and characterization of new amorphous Si/B/N/C ceramics with increased carbon content through single-source precursors

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Jäschke, T.
Abteilung Jansen, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Jansen, M.
Abteilung Jansen, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Jäschke, T., & Jansen, M. (2004). Synthesis and characterization of new amorphous Si/B/N/C ceramics with increased carbon content through single-source precursors. Comptes Rendus Chimie, 7(5), 471-482.

Cite as: https://hdl.handle.net/21.11116/0000-000E-F82F-7

Abstract

New molecular single-source precursors for the preparation of
carbon-rich random inorganic networks in the quaternary system Si/B/N/C
have been synthesized and fully characterized by spectroscopic methods
(infrared, nuclear magnetic resonance and mass spectrometry). As a new
structural feature, the precursors contain a methylene bridge between
silicon and boron leading to an efficient incorporation of carbon into
the random network. Cross linking of the single-source precursors
Cl3Si-CH2-BCl2 (trichlorosilyl dichloroboryl methane) and
(CH3)Cl2Si-CH2-BCl2 (dichlorosityl dichloroboryl methane) with
methylamine and subsequent pyrolysis of the resultant preceramic
polymers at 1500 degreesC in an inert gas atmosphere yield the
amorphous ceramics Si3B3N7C5 and Si3B3N5Cl7 respectively. Both
compositions exhibit high-temperature stability with only low mass
losses at heating them to 2000 degreesC and, at the same time, they
show a remarkable resistance against oxidation in pure oxygen at least
up to 1300 degreesC. (C) 2004 Academie des sciences. Published by
Elsevier SAS. All rights reserved.