Effect of pyrolysis temperature on the electric conductivity of polymer-derived silicoboron carbonitride

The electric conductivity of polymer-derived SiBCNs pyrolyzed at different temperatures was studied. We showed that the boron impeded the graphitization of the free-carbon phase in the SiBCN, leading to a higher characteristic temperature and activation energy as compared to the SiCN. Such an impedi...

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Published inJournal of the European Ceramic Society Vol. 34; no. 10; pp. 2163 - 2167
Main Authors Chen, Yaohan, Yang, Xueping, Cao, Yejie, An, Linan
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.09.2014
Subjects
Activation energy
Carbon
Electric conductivity
Precursors-organic
SiBCN ceramics
Precursors-organic
Activation energy
Carbon
SiBCN ceramics
Electric conductivity
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Summary:The electric conductivity of polymer-derived SiBCNs pyrolyzed at different temperatures was studied. We showed that the boron impeded the graphitization of the free-carbon phase in the SiBCN, leading to a higher characteristic temperature and activation energy as compared to the SiCN. Such an impeding effect is due to the interaction between h-BN and graphite phase. We also provided a credible evidence to show that the increase in the electric conductivity of the SiBCN with pyrolysis temperature is likely due to the increase in the conductivity of the free-carbon phase.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2014.03.012