The amorphous nature of C/sub 60/ hard carbon manifested in its specific heat, sound velocity and heat conduction. (CROSBI ID 95054)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Biljaković, Katica ; Kozlov, Mikhail ; Starešinić, Damir ; Saint-Paul, Michel
engleski
The amorphous nature of C/sub 60/ hard carbon manifested in its specific heat, sound velocity and heat conduction.
Detailed measurements of the specific heat, thermal conductivity and relative variation of the sound velocity in the temperature range 2-280 K for hard fullerene-based carbon are reported. The novel material was obtained from pressure-temperature treatment of C/sub 60/ fullerene and is known for a unique combination of its diamond-like hardness and high electrical conductivity. The substance was found to possess an unconventional, close-to-linear temperature dependence of the thermal conductivity over almost the entire temperature range. The specific heat of hard carbon exhibited a very large linear contribution to the specific heat at low temperatures, but no excess contribution to C/sub p//T/sup 3/, and a deviation from the Debye dependence above 6 K. The sound velocity decreased linearly from 4 up to 120 K. These results are consistent with the concept of a glassy solid formed by polymerized and partially transformed fullerene clusters.
fullerene; hard carbon; thermal properties
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