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Anomalous electrical behavior of partially carbonized polyacrylonitrile fibers

Published online by Cambridge University Press:  03 March 2011

Bor Z. Jang  and
Liren Zhao
Bor Z. Jang*
Affiliation:
Materials Engineering Program, 201 Ross Hall, Auburn University, Auburn, Alabama 36849
Liren Zhao
Affiliation:
Materials Engineering Program, 201 Ross Hall, Auburn University, Auburn, Alabama 36849
*
a)Author to whom all correspondence should be addressed.
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Abstract

Partially carbonized polyacrylonitrile fibers were observed to undergo a resistivity change of 2 to 4 orders of magnitude at a transition temperature typically in the range of 98 °C to 200 °C. The current-voltage curves exhibited an initial supercurrent-like increase, followed by a rapid drop to a high resistance state, and then a rise in current again at a later stage. These phenomena cannot be interpreted by existing theories on switching in inorganic amorphous semiconductors. They are explainable if the microstructure of the pyrolyzed fiber is viewed as comprising nanometer-scale superconducting phases interspersed with semiconducting phases, much like a large number of Josephson junctions connected in series.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 10 , October 1995 , pp. 2449 - 2453
Copyright
Copyright © Materials Research Society 1995

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