engleski

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

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.

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

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