Naslov
Thermal transport properties in complex metallic alloys

Autori
Popčević, Petar ; Bilušić, Ante ; Dolinšek, Janez ; Smontara, Ana

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

Izvornik
Proceedings of C-Mac Days 2012 / - , 2012

Skup
C-MAC Days

Mjesto i datum
Kraków, Poljska, 10.12.2012. - 13.12.2012

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
thermal conductivity; quasicrystals; complex metallic alloys

Sažetak
Apart from the electronic structure that is most usually probed (electrical resistivity, thermopower, Hall efect, etc.) thermal conductivity can be used to get some insight into the phonon band structure and dynamics. In conventional crystals, temperature dependence of the thermal conductivity is dominated with strong umklapp maximum which position is strongly correlated with the Debye temperature and usually appears below 50 K. At higher temperatures thermal conductivity decreases and saturates. Temperature dependence of the thermal conductivity of the amorphous materials, on the other hand, due to lack of periodicity and no long range order shows no umklapp maximum but some plateau instead. They have lower thermal conductivities generally and at higher temperatures their thermal conductivity further increases saturating finally at some value. Quasicrystals have no periodicity, but they possess long range order. Temperature dependence of their thermal conductivities usually show plateau or shallow maximum at intermediate temperatures, but at higher temperatures it continues to increase, and very often with no indication of saturation. Here we present thermal transport properties in several Al-based icosahedral and decagonal quasicrystals [1, 2] together with analysis proposed. We kindly acknowledge P.Gille from Ludwig-Maximilians-Universität München, Germany, Y.Yokoyama from Himeji Institute of Technology, Japan, J. R. Fischer and P. Canfield from Ames Laboratory, Iowa State University, USA for providing us with high quality samples. 1. P. Popčević, D. Stanić, Ž. Bihar, A. Bilušić and A. Smontara, Isr. J. Chem. 51 (2011), p. 1340. 2. M. Bobnar, P. Jeglič, M. Klanjšek, Z. Jagličić, M. Wencka, P. Popčević, J. Ivkov, D. Stanić, A. Smontara, P. Gille and J. Dolinšek, Phys. Rev. B 85 (2012) p. 024205.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
This work was done within the activities of the European Integrated Center for the Development of New Metallic Alloys and Compounds - C-MAC. The paper was presented as an invited talk by Petar Popčević.

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