Pregled bibliografske jedinice broj: 84327
Unusual Properties of Hard Fullerene-Based Carbons
Unusual Properties of Hard Fullerene-Based Carbons // Europhysics conference abstracts / Battistig, G. ; Hajdu, Cs. ; Nagy, D.L. ; Szilagyi (ur.).
Budimpešta: European Physical Society (EPS), 2002. str. 340-341 (poster, međunarodna recenzija, sažetak, znanstveni)
CROSBI ID: 84327 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Unusual Properties of Hard Fullerene-Based Carbons
Autori
Bilušić, Ante ; Gradečak, Silvija ; Lasjaunias, J. C. ; Saint-Paul, M. ; Smontara, Ana ; Bennington, S. M. ; Kitamura, N. ; Buga, S. G
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
Europhysics conference abstracts
/ Battistig, G. ; Hajdu, Cs. ; Nagy, D.L. ; Szilagyi - Budimpešta : European Physical Society (EPS), 2002, 340-341
Skup
12th General Conference of the European Physical Society EPS-12, Trends in Physics
Mjesto i datum
Budimpešta, Mađarska, 26.08.2002. - 30.08.2002
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 pressuretemperature treatment of C60 and C70 and are known for a unique combination of their diamond-like hardness and amorphous carbon-like electrical conductivity. Xray diffraction and high-resolution transmission electron microscopy investigations have revealed that nanocrystalline and amorphous phases co-exist in samples of both kind of hard fullerene-based carbons, i.e. C60 and C70. The materials possess an unusual, linear or close-to-linear temperature dependence of the thermal conductivity above 20 K. Between 0.1 K and 10 K the thermal conductivity of C60 is characterized by a monotonous increase versus temperature (power law T1.4), 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 obtained data are compared with thermal conductivity in diamond, graphite and 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
