Abstract
The conductivity of polymer-derived SiOCN ceramics exhibited an Arrhenius dependence on pyrolysis
temperature, with the activation energy of ~3.95 eV. The formation and structure change of
the free carbon phase were detected by means of electron spin resonance spectroscopy and X-ray
photoelectron spectroscopy. It reveals that the number of dangling bonds on the free carbon is increased
as pyrolysis temperature increases, with the activation energy of ~3.87 eV. So it is demonstrated
that the pyrolysis-temperature induced increase in the conductivity is mainly attributed to
the increase of dangling on the graphite-like carbon.
Keywords
Polymer Derived SiOCN Ceremic, Free Carbon, Activation Energy