Abstract
The transverse magnetoresistance was studied at liquid nitrogen temperature for carbons with two phases, the turbostratic and the graphitic. Samples investigated were carbons prepared by heat treatment at temperatures between 1320 and 1780°C under pressure of 5 kbar. The starting materials were a coke obtained from polyvinyl chloride carbonized up to 680°C, and an equi-weight mixture of the same coke with a thermal black. Samples obtained from the coke alone by the heat treatment above 1470°C consist of two phases. When the fractionof the graphitic phase ranges 0.5–6%, two new types of field dependence of the transverse magnetoresistance, types 1 and 2, are observed. The field dependence of the magnetoresistance were reproduced by using a model composed of a 2900°C-treated pyrolytic graphite and of a 1900°C-treated extruded petroleum coke carbon, when the resistance ratio between the two components was properly adjusted. This seems to show that the new types of field dependence found in this work are due to the presence of a mixture of graphitic and turbostratic grains in our samples.
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