Complex Impedance Spectra of Polymer-Derived Silicon Oxycarbides

Authors

  • Kewei Wang,

    1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi, China
    Search for more papers by this author
  • Baisheng Ma,

    1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi, China
    Search for more papers by this author
  • Yiguang Wang,

    Corresponding author
    • School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi, China
    Search for more papers by this author
    • Member, The American Ceramic Society
  • Linan An

    Corresponding author
    1. Department of Materials Science and Engineering, Advanced Materials Processing and Analysis Center, University of Central Florida, Orlando, Florida
    • School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi, China
    Search for more papers by this author
    • Member, The American Ceramic Society

Authors to whom correspondence should be addressed. e-mails: wangyiguang@nwpu.edu.cn and lan@mial.ucf.edu

Abstract

The complex impedance spectra of polymer-derived amorphous silicon oxycarbides synthesized at different temperatures are reported. Analysis of the spectra using equivalent circuit models showed that the conduction of current is dominantly through the matrix and free carbon in series, instead of through the matrix or free carbon only. We found that the conductivity of both matrix and free-carbon phase increases with increasing synthesis temperature, whereas the relaxation time of the matrix is much shorter than that of the free carbon. The results are correlated with the structures of the materials.

Ancillary