ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Semiconducting carbon fibres were prepared from polyacrylonitrile precursor by pyrolysis in an inert atmosphere in temperature range 550–800 °C. The obtained fibres have an electrical resistivity between 104 and 10−2 Ω cm−1 and showed negative temperature coefficients. Electrical resistivity was mainly governed by the pyrolysis temperature and both electrical resistivity, ρ, and thermistor constant,B, decreased with increasing pyrolysis temperature and duration. A linear relation between log ρ and thermistor constantB was observed. Chemical analysis and infrared spectra indicated that the concentration of nitrogen and hydrogen decreased and basal plane structure developed accompanying an increase in carbon content as the pyrolysis temperature increased.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01151825
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