Thermal Conductivity of Taylor Phase Al_3(Mn,Pd) Complex Metallic Alloys

Stanić, Denis and Popčević, Petar and Smiljanić, Igor and Bihar, Željko and Bilušić, Ante and Batistić, Ivo and Ivkov, Jovica and Hegen, Marc and Feuerbacher, Michael (2010) Thermal Conductivity of Taylor Phase Al_3(Mn,Pd) Complex Metallic Alloys. Croatica Chemica Acta, 83 (1). pp. 81-86. ISSN 0011-1643

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Abstract

Thermal conductivity, κ, of Taylor phase T-Al_73Mn_27–xPd_x (x = 0,2,4,6) complex metallic alloys (CMAs) has been studied in the temperature interval from 2 K to 300 K. The characteristics of κ are typical for the CMAs: a relatively small value, a change of slope at about 50 K and an increase of slope above 100 K. The value of κ is between 2.7 W/m K and 3.7 W/m K at room temperature. The low thermal conductivity has it’s origin in a complex structure: aperiodic on a short length scale, which leads to frequent electron scattering (i.e. to a low electronic contribution to the thermal conductivity), while the large lattice constant defines a small Brillouin zone that enhances umklapp scattering of extended phonons. Above 100 K the non-extended (localized) lattice vibrations are thermally excited, and hopping gives a new heat carrying channel resulting in typical increase of the thermal conductivity with temperature.

Item Type: Article
Keywords: thermal conductivity, Wiedemann-Franz law, Debye model, localized lattice vibrations, bipolar diffusion
Date: 2010
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Project code: 119-1191458-0512, 177-0352826-0478, 035-0352826-2848, 035-0352826-2847, 286-0000000-3212
Publisher: Hrvatsko kemijsko društvo
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 23 Apr 2014 18:57
Last Modified: 24 Feb 2016 15:49
URI: http://digre.pmf.unizg.hr/id/eprint/935

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