Effect of precursor on speciation and nanostructure of SiBCN polymer-derived ceramics

Scarlett Widgeon, Gabriela Mera, Yan Gao, Sabyasachi Sen, Alexandra Navrotsky, Ralf Riedel

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)1651-1659
Number of pages9
JournalJournal of the American Ceramic Society
Volume96
Issue number5
DOIs
StatePublished - May 2013
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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