Naslov
Disordered Nature of Hard Fullerene-Based Carbons

Autori
Smontara, Ana ; Lasjaunias, J.C. ; Saint-Paul, M. ; Bilušić, Ante ; Gradečak, S.

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
From Solid State To Biophysics / Laszlo, Forro ; Pavuna, Davor - Zagreb, 2002, 59-59

Skup
International Conference "From Solid State To Biophysics"

Mjesto i datum
Cavtat, Hrvatska, 13.06.2002. - 19.06.2002

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
fullerene; thermal conductivity; sound velocity

Sažetak
We report on detailed investigations of the thermal and acoustical properties on hard fullerene-based carbons. The novel materials were obtained from pressure-temperature treatment of C60 and C70 and are known for a unique combination of its diamond-like hardness and amorphous carbon-like electrical conductivity. X-ray diffraction and high-resolution transmission electron microscope investigations have revealed that nanocrystalline and amorphous phases co-exist in samples both of kind hard fullerene-based carbons C60 and C70. The materials possess an unususal, linear or close-to linear temperature dependence of the thermal conductivity above 20 K. While, the thermal conductivity of C60 is characterized by a monotonous increase versus temperature, power law T1.4, for 0.1 K<T<10 K, without a well defined plateau around 5-10 K. Sound velocity decreases linearly from 4 K up to 100 K. Both linear regimes are characteristic of disordered structures, and can be analysed by the phonon-fracton hopping model developed for fractal and amorphous structures. The data obtained are compared with thermal conductivity in diamond, graphite, glassy carbon and are consistent with the structure of a disordered or amorphous-like solid formed by polymerisation and partially transformed fullerene clusters.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA