Effect of demixing and coarsening on the energetics of poly(boro)silazane- derived amorphous Si-(B-)C-N ceramics

Yan Gao, Scarlett J. Widgeon, Tien B. Tran, Amir Hossein Tavakoli, Gabriela Mera, Sabyasachi Sen, Ralf Riedel, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Novel poly(boro)silazane-derived Si-(B-)C-N ceramics pyrolyzed at 1100 and 1400 C were analyzed by multinuclear magic-angle spinning nuclear magnetic resonance spectroscopy and high-temperature oxidative solution calorimetry to investigate the energetic effects of nanodomain structure evolution at two critical pyrolysis temperatures. Like other Si-B-C-N ceramics, increasing pyrolysis temperatures result in the demixing of SiCxN 4-x mixed bond environments into SiC4 and SiN4 tetrahedra, interdomain bond cleavage and nanodomain coarsening. Concurrent demixing and domain coarsening, processes detrimental to these ceramics, were found to be energetically stabilizing.

Original languageEnglish (US)
Pages (from-to)347-350
Number of pages4
JournalScripta Materialia
Volume69
Issue number5
DOIs
StatePublished - Sep 2013
Externally publishedYes

Keywords

  • Amorphous materials
  • Nanostructure
  • Nuclear magnetic resonance (NMR)
  • Polymer-derived ceramics
  • Thermodynamics

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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