Thermodynamically stable Si wC xN yO z polymer-like, amorphous ceramics made from organic precursors

Riham M. Morcos, Alexandra Navrotsky, Tamas Varga, Dongjoon Ahn, Atanu Saha, Fabrizia Poli, Klaus Müller, Rishi Raj

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

This communication reports new results on the enthalpy of formation of pseudo-amorphous ceramic compounds constituted from silicon, carbon, oxygen, and nitrogen (SiCNO), made from the polymer route. Again, like the SiCO materials, although with one exception, the enthalpy of formation from crystalline components (SiO 2 cristobalite, β-Si 3N 4, SiC, and excess C) is negative. Some of the alloyed oxygen-nitrogen compositions yield enthalpies that are much more negative (̃100 kJ/g . atom) in comparison with compositions that contain mainly oxygen or nitrogen (̃20 kJ/g×atom). The exception, having a N/O ratio near 2, has a positive value for the enthalpy. This may reflect the presence of nanoclusters of stoichiometric Si 2N 2O instead of the pseudo-amorphous nanodomain structure seen for the other samples.

Original languageEnglish (US)
Pages (from-to)2391-2393
Number of pages3
JournalJournal of the American Ceramic Society
Volume91
Issue number7
DOIs
StatePublished - Jul 2008
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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