Naslov
The amorphous nature of C/sub 60/ hard carbon manifested in its specific heat, sound velocity and heat conduction.

Autori
Biljaković, Katica ; Kozlov, Mikhail ; Starešinić, Damir ; Saint-Paul, Michel

Izvornik
Journal of Physics-Condensed Matter (0953-8984) 14 (2002), 25; 6403-6412

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
fullerene; hard carbon; thermal properties

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA