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Effect of Precursor on Speciation and Nanostructure of SiBCN Polymer-Derived Ceramics

Widgeon, Scarlett and Mera, Gabriela and Gao, Yan and Sen, Sabyasachi and Navrotsky, Alexandra and Riedel, Ralf and Colombo, P. (2013):
Effect of Precursor on Speciation and Nanostructure of SiBCN Polymer-Derived Ceramics.
In: Journal of the American Ceramic Society, Wiley-VCH Verlag GmbH & Co. KGaA, pp. 1651-1659, 96, (5), ISSN 00027820,
[Online-Edition: http://dx.doi.org/10.1111/jace.12192],
[Article]

Abstract

A comparative structural study of silicon borocarbonitride polymer-derived ceramics synthesized using polyborosilylcarbodiimide and polyborosilazane precursors is carried out using high-resolution, multinuclear, one- and two- dimensional NMR spectroscopy. The polyborosilylcarbodiimide-derived ceramics contain relatively pure Si3N4 and C nanodomains with the BN domains being present predominantly at the interface such that the bonding at the interface consists of Si–N–B, Si–N–C, and B–N–C linkages. In contrast, the structure of the polyborosilazane-derived ceramics consists of significant amount of mixed bonding in the nearest-neighbor coordination environments of Si and B atoms leading to the formation of SiCxN4−x (0 ≤ x ≤ 4) tetrahedral units and BCN2 triangular units. The interfacial region between the SiCN and C nanodomains is occupied by the BCN phase. These results demonstrate that the chemistry of the polymeric precursors exerts major influence on the microstructure and bonding in their derived ceramics even when the final chemical compositions of the latter are similar.

Item Type: Article
Erschienen: 2013
Creators: Widgeon, Scarlett and Mera, Gabriela and Gao, Yan and Sen, Sabyasachi and Navrotsky, Alexandra and Riedel, Ralf and Colombo, P.
Title: Effect of Precursor on Speciation and Nanostructure of SiBCN Polymer-Derived Ceramics
Language: English
Abstract:

A comparative structural study of silicon borocarbonitride polymer-derived ceramics synthesized using polyborosilylcarbodiimide and polyborosilazane precursors is carried out using high-resolution, multinuclear, one- and two- dimensional NMR spectroscopy. The polyborosilylcarbodiimide-derived ceramics contain relatively pure Si3N4 and C nanodomains with the BN domains being present predominantly at the interface such that the bonding at the interface consists of Si–N–B, Si–N–C, and B–N–C linkages. In contrast, the structure of the polyborosilazane-derived ceramics consists of significant amount of mixed bonding in the nearest-neighbor coordination environments of Si and B atoms leading to the formation of SiCxN4−x (0 ≤ x ≤ 4) tetrahedral units and BCN2 triangular units. The interfacial region between the SiCN and C nanodomains is occupied by the BCN phase. These results demonstrate that the chemistry of the polymeric precursors exerts major influence on the microstructure and bonding in their derived ceramics even when the final chemical compositions of the latter are similar.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 96
Number: 5
Publisher: Wiley-VCH Verlag GmbH & Co. KGaA
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 04 Feb 2014 09:42
Official URL: http://dx.doi.org/10.1111/jace.12192
Identification Number: doi:10.1111/jace.12192
Funders: Funded by National Science Foundation. Grant Number: MWN-0906070., Funded by Fonds der Chemischen Industrie.
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