Energetics of SixOyCz polymer-derived ceramics prepared under varying conditions

Riham Michelle Morcos, Alexandra Navrotsky, Tamas Varga, Yigal Blum, Dongjoon Ahn, Fabrizia Poli, Klaus Müller, Rishi Raj

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

Incorporation of carbon at the molecular level can create unusual amorphous and nanostructures of Si-C-O polymer-derived ceramics by controlled pyrolysis of crosslinked polysiloxanes. These ceramics can resist crystallization to ultrahigh temperatures. In this work, we support earlier studies that the resistance to crystallization of these nanodomain networks is due to thermodynamic as well as kinetic factors. Calorimetric measurements of heats of dissolution in a molten oxide solvent show that these ceramics posses a negative enthalpy relative to their crystalline constituents (silicon carbide, cristobalite, and graphite). Si-C-O ceramics pyrolyzed at 1000° and 1450°C appear somewhat more energetically stable than those prepared at 1200°C.

Original languageEnglish (US)
Pages (from-to)2969-2974
Number of pages6
JournalJournal of the American Ceramic Society
Volume91
Issue number9
DOIs
StatePublished - Sep 2008
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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