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

Scientific paper - Original scientific paper

• Author: Denis Stanić
• Author: Petar Popčević
• Author: Igor Smiljanić
• Author: Željko Bihar
• Author: Ante Bilušić
• Author: Ivo Batistić
• Author: Jovica Ivkov
• Author: Marc Hegen
• Author: Michael Feuerbacher
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

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.

• Keywords (english): thermal conductivity; Wiedemann-Franz law; Debye model; localized lattice vibrations; bipolar diffusion
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Croatica Chemica Acta
• Numbering: vol. 83, no. 1, pp. 81-86
• p-ISSN: 0011-1643
• e-ISSN: 1334-417X
• URN:NBN: urn:nbn:hr:217:231014
• Publication: 2010
• Project: Number: 119-1191458-0512; Title (croatian): Niskodimenzionalni jako korelirani vodljivi sustavi; Leader: Slaven Barišić; Jurisdiction: Croatia; Funding stream: ZP
• Project: Number: 177-0352826-0478; Title (croatian): Transportna i magnetska svojstva nanostrukturiranih kompleksnih metalnih spojeva; Leader: Ante Bilušić; Jurisdiction: Croatia; Funding stream: ZP
• Project: Number: 035-0352826-2848; Title (croatian): Transport topline i naboja u jako frustriranim magnetima i srodnim materijalima; Leader: Ana Smontara; Jurisdiction: Croatia; Funding stream: ZP
• Project: Number: 035-0352826-2847; Title (croatian): Modeliranje fizikalnih svojstava materijala s izraženom frustracijom ili neredom; Leader: Eduard Tutiš; Jurisdiction: Croatia; Funding stream: ZP
• Project: Number: 286-0000000-3212; Title (croatian): Radioaktivnost u okolišu, detekcija i primjena; Leader: Josip Planinić; Jurisdiction: Croatia; Funding stream: ZP
• Document URL: https://hrcak.srce.hr/52241
• Type of resource: Text
• Access conditions: Open access
• Created on: 2019-11-01 19:49:01