Area of research
Ceramics and Composites · Materials Chemistry
Research interest
Research topics from publications: Semiconductor‐conductor transition of pristine polymer‐derived ceramics SiC pyrolyzed at temperature range from 1200°C to 1800°C; Electrical Conductivity and Structural Evolution of Polymer-Derived SiC Ceramics Pyrolyzed From 1200 °C to 1800 °C. Representative work: Abstract This paper studies the effect of pyrolysis temperature on the semiconductor‐conductor transition of pristine polymer‐derived ceramic silicon carbide (PDC SiC). A comprehensive study of microstructural evolution and conduction mechanism of PDC SiC pyrolyzed at the temperature range of 1200°C‐1800°C is presented. At relatively lower pyrolysis temperatures (1200°C‐1600°C), the carbon phase goes through a microstructural evolution from amorphous carbon to nanocrystalline carbon. The PDC SiC samples behave as a semiconductor and the electron transport is governed by the band tail hopping (BTH) mechanism in low pyrolysis temperature (1300°C); by a mixed mechanism driven by band tail hoppi Abstract Room temperature (RT) electrical conductivity and microstructure of polymer-derived SiC pyrolyzed at temperatures ranging from 1200 °C to 1800 °C were studied. We have shown that both free carbon content and pyrolysis temperature have significant effects on the DC conductivity of polymer derived ceramic (PDC) SiC. The RT DC conductivity of the PDC SiC increased gradually with increasing pyrolysis temperature, and it drastically increases 3 orders of magnitude after 1500 °C. This high electrical conductivity occurs due to the formation of a network of turbostratic carbon (percolative network). Below the percolation regime, hopping enables the electron movement from one carbon cluster