Accession Number : ADA191723

Title :   Observation of Metallic Conductivity in Liquid Carbon.

Descriptive Note : Rept. for 1 Sep 86-31 Aug 87,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s) : Heremans, J ; Olk, C H ; Eesley, G L ; Steinbeck, J ; Dresselhaus, G

PDF Url : ADA191723

Report Date : 30 Oct 1987

Pagination or Media Count : 16

Abstract : The temperature dependence of the electrical resistivity of carbon fibers has been measured at atmospheric pressure and for temperatures up to and above the melting point at 4450 Kelvin. Vapor-grown graphite fibers of different crystalline perfection were heated with electrical pulses 28 microseconds in duration. The transient reflectivity of graphite irradiated with picosecond laser pulses was also measured and the results show evidence for nonequilibrium heating. From this work, it is concluded that liquids carbon is metallic with a nearly temperature independent electrical resistivity of 30 micro-ohm centimeters. Keywords: Liquids carbon, High temperature resistivity of carbon fibers, Transient reflectivity of carbon fibers.

Descriptors :   *CARBON, *CONDUCTIVITY, *LIQUIDS, BAROMETRIC PRESSURE, CARBON FIBERS, ELECTRICAL RESISTANCE, GRAPHITE, HEATING, HIGH TEMPERATURE, LIGHT PULSES, METALS, NONEQUILIBRIUM FLOW, OBSERVATION, REFLECTIVITY, RESISTANCE, TEMPERATURE, TRANSIENTS

Subject Categories : Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE