Effect of demixing and coarsening on the energetics of poly(boro)silazane-derived amorphous Si–(B–)C–N ceramics
Effect of demixing and coarsening on the energetics of poly(boro)silazane-derived amorphous Si–(B–)C–N ceramics
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分层和粗化对聚(硼)硅氮烷衍生的无定形 Siâ(Bâ)CâN 陶瓷能量学的影响
DOI:
10.1016/j.scriptamat.2013.04.022
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发表时间:
2013
影响因子:
6
通讯作者:
Alexandra Navrotsky
中科院分区:
文献类型:
--
作者:
Yan Gao;Scarlett Widgeon;Tien B. Tran;Amir H. Tavakoli;Gabriela Mera;Sabyasachi Sen;Ralf Riedel;Alexandra Navrotsky
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−xmixed bond environments into SiC4and SiN4tetrahedra, interdomain bond cleavage and nanodomain coarsening. Concurrent demixing and domain coarsening, processes detrimental to these ceramics, were found to be energetically stabilizing.
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DOI:
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