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

Gao, Yan and Widgeon, Scarlett J. and Tran, Tien B. and Tavakoli, Amir Hossein and Mera, Gabriela and Sen, Sabyasachi and Riedel, Ralf and Navrotsky, Alexandra (2013):
Effect of demixing and coarsening on the energetics of poly(boro)silazane-derived amorphous Si–(B–)C–N ceramics.
In: Scripta Materialia, Elsevier Science Publishing, pp. 347-350, 69, (5), ISSN 13596462,
[Online-Edition: http://dx.doi.org/10.1016/j.scriptamat.2013.04.022],
[Article]

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 SiCxN4−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.

Item Type: Article
Erschienen: 2013
Creators: Gao, Yan and Widgeon, Scarlett J. and Tran, Tien B. and Tavakoli, Amir Hossein and Mera, Gabriela and Sen, Sabyasachi and Riedel, Ralf and Navrotsky, Alexandra
Title: Effect of demixing and coarsening on the energetics of poly(boro)silazane-derived amorphous Si–(B–)C–N ceramics
Language: English
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 SiCxN4−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.

Journal or Publication Title: Scripta Materialia
Volume: 69
Number: 5
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Polymer-derived ceramics, Nuclear magnetic resonance (NMR), Thermodynamics, Amorphous materials, Nanostructure
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: 19 Feb 2014 13:31
Official URL: http://dx.doi.org/10.1016/j.scriptamat.2013.04.022
Identification Number: doi:10.1016/j.scriptamat.2013.04.022
Funders: This study was supported by the National Science Foundation-Deutsche Forschungsgemeinschaft (NSF-DFG) Materials World Network (MWN-0907792) under the collaborative project, “Nanostructure and thermodynamics of polymer-derived ceramics”.
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