Naslov
Thermoelectrical properties of monocrystalline Al64Cu23Fe13 quasicrystal

Autori
Smiljanić, Igor ; Bilušić, Ante ; Bihar, Željko ; Lukatela, Jagoda ; Leontić, Boran ; Dolinšek, J. ; Smontara, Ana

Izvornik
Materiali in tehnologije (1580-2949) 41 (2007), 6; 265-270

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

Ključne riječi
Quasicrystals ; i-AlCuFe ; Physical properties ; Resistivity ; Thermal conductivity

Sažetak
We performed investigations of the electrical resistivity, thermopower and thermal conductivity of a single-crystalline i-Al64Cu23Fe13 as well as a polycrystalline i-Al63Cu25Fe12 icosahedral quasicrystal, for comparison. Electrical resistivity of both samples, the monocrystalline i-Al64Cu23Fe13 and the polycrystalline i-Al63Cu25Fe12, exhibits a negative temperature coefficient with ro(4K)=3950Ohmcm and ro(4K)=4900Ohmcm, and the ratio ro(4K)/ro(300K)=1.8, ro(4K)/ro(300K)=1.7, respectively. The thermopowers are large with negative sign, in addition, the thermopower of single-crystalline i-Al64Cu23Fe13 exhibits a sign reversal at T=278 K. The thermal conductivity is anomalously low, order of 1 W/mK at room temperature, with a slightly different temperature variation at low temperatures. On the basis of these results, we concluded that there are no systematic differences between the high-quality monocrystalline and polygrain icosahedral i-Al-Cu-Fe quasicrystals. Moreover, the reported transport properties of i-Al-Cu-Fe appear to be intrinsic to this family of icosahedral quasicrystals.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
The paper was presented at the "14. međunarodni znanstveni sestanek Vakuumska znanost in tehnika", Bled, 1. junij 2007, as a poster by Igor Smiljanić. This work was supported by the 6th Framework EU Network of Excellence 'Complex Metallic Alloys' (Contract No. NMP3-CT-2005-500140)

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