Widgeon, Scarlett ; Mera, Gabriela ; Gao, Yan ; Sen, Sabyasachi ; Navrotsky, Alexandra ; Riedel, Ralf ; Colombo, P. (2013)
Effect of Precursor on Speciation and Nanostructure of SiBCN Polymer-Derived Ceramics.
In: Journal of the American Ceramic Society, 96 (5)
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 ; Mera, Gabriela ; Gao, Yan ; Sen, Sabyasachi ; Navrotsky, Alexandra ; Riedel, Ralf ; Colombo, P. |
| Type of entry: | Bibliographie |
| Title: | Effect of Precursor on Speciation and Nanostructure of SiBCN Polymer-Derived Ceramics |
| Language: | English |
| Date: | May 2013 |
| Publisher: | Wiley-VCH Verlag GmbH & Co. KGaA |
| Journal or Publication Title: | Journal of the American Ceramic Society |
| Volume of the journal: | 96 |
| Issue Number: | 5 |
| URL / URN: | http://dx.doi.org/10.1111/jace.12192 |
| 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. |
| Identification Number: | doi:10.1111/jace.12192 |
| 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 |
| Last Modified: | 04 Feb 2014 09:42 |
| PPN: | |
| Funders: | Funded by National Science Foundation. Grant Number: MWN-0906070., Funded by Fonds der Chemischen Industrie. |
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