期刊
SCRIPTA MATERIALIA
卷 69, 期 5, 页码 347-350出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2013.04.022
关键词
Polymer-derived ceramics; Nuclear magnetic resonance (NMR); Thermodynamics; Amorphous materials; Nanostructure
类别
资金
- National Science Foundation-Deutsche Forschungsgemeinschaft (NSF-DFG) Materials World Network [MWN-0907792]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0907792] Funding Source: National Science Foundation
Novel poly(boro)silazane-derived Si-(B-)C-N ceramics pyrolyzed at 1100 and 1400 degrees 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. (c) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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