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Croatica Chemica Acta, Vol.83 No.1 Travanj 2010.

Izvorni znanstveni članak

Thermal Conductivity of Taylor Phase Al3(Mn,Pd) Complex Metallic Alloys

Denis Stanić ; Laboratory for the Physics of Transport Phenomena, Institute of Physics, Bijenička c. 46, P. O. Box 304, HR-10001 Zagreb, Croatia
Petar Popčević ; Laboratory for the Physics of Transport Phenomena, Institute of Physics, Bijenička c. 46, P. O. Box 304, HR-10001 Zagreb, Croatia
Igor Smiljanić ; Laboratory for the Physics of Transport Phenomena, Institute of Physics, Bijenička c. 46, P. O. Box 304, HR-10001 Zagreb, Croatia
Željko Bihar ; Laboratory for the Physics of Transport Phenomena, Institute of Physics, Bijenička c. 46, P. O. Box 304, HR-10001 Zagreb, Croatia
Ante Bilušić ; Laboratory for the Physics of Transport Phenomena, Institute of Physics, Bijenička c. 46, P. O. Box 304, HR-10001 Zagreb, Croatia; Physics Department, Faculty of Natural Sciences and Mathematics, University of Split, Nikole Tesle 12, HR-21000 Split, Croa
Ivo Batistić ; Department of Physics, Faculty of Science, University of Zagreb, Bijenička c. 32, HR-10000 Zagreb, Croatia
Jovica Ivkov ; Laboratory for the Physics of Transport Phenomena, Institute of Physics, Bijenička c. 46, P. O. Box 304, HR-10001 Zagreb, Croatia
Marc Hegen ; Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany
Michael Feuerbacher ; Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany

Puni tekst: engleski, pdf (295 KB) str. 81-86 preuzimanja: 349* citiraj
APA
Stanić, D., Popčević, P., Smiljanić, I., Bihar, Ž., Bilušić, A., Batistić, I., Ivkov, J., Hegen, M., Feuerbacher, M. (2010). Thermal Conductivity of Taylor Phase Al3(Mn,Pd) Complex Metallic Alloys. Croatica Chemica Acta, 83(1), 81-86. Preuzeto s http://hrcak.srce.hr/52241

Sažetak

Thermal conductivity, κ, of Taylor phase T-Al73Mn27–xPdx (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.

Ključne riječi
thermal conductivity; Wiedemann-Franz law; Debye model; localized lattice vibrations; bipolar diffusion

Hrčak ID: 52241

URI
http://hrcak.srce.hr/52241

Posjeta: 680 *