Naslov
Low-temperature transport properties of the epsilon-phases Al-Pd-(Mn, Fe, Co, Rh, ...)

Autori
Stanić, Denis ; Smiljanić, Igor ; Barišić, Neven ; Dolinšek, J. ; Bilušić, Ante ; Lukatela, Jagoda ; Leontić, Boran ; Smontara, Ana

Izvornik
Materiali in tehnologije (1580-2949) 42 (2008), 3; 105-110

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, kongresno priopćenje, znanstveni

Ključne riječi
epsilon-phases in the AlPd (Mn ; Fe ; Co ; Rh) systems ; electrical and thermal conductivity

Sažetak
We report results of the low tempertature investigations of the electrical and thermal conductivity of the epsilon-phases in the AlPd (Mn, Fe, Co, Rh) systems, that are characterized by giant unit cells with quasicrystals-like cluster substructure. Electrical resistivity is of the order 0, 0001 Ohmcm, and shows weak temperature dependence in the investigated temperature range 2-300 K. An interesting feature of the epsilon-phases is their low thermal conductivity, which is at room temperature comparable to that of thermal insulators amorphous SiO2 and Zr//YO2 ceramics. While SiO2 and Zr/YO2 are also electrical insulators, epsilon-phases exhibit electrical conductivity typical of metallic alloys, so that they offer an interesting combination of an electrical conductor with a thermal insulator. The reason for the weak thermal conductivity of the epsilon-phases appears to be structural: large and heavy atomic clusters of icosahedral symmetry in the giant unit cell prevent the propagation of extended phonons, so that the lattice can no more efficiently participate in the heat transport.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Rad je koautor Denis Stanić prezentirao na skupu
"14. međunarodni znanstveni sestanek Vakuumska
znanost in tehnika", održanom 01.06.2007.g., Bled,
Slovenija.

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