engleski

Thermal conductivity of taylor phase Al3 (Mn, Pd) complex metalic alloys

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. Characteristic of κ are typical for CMAs: relatively small in magnitude, change of slope at about 50 K and increase above 100 K. At room temperature the magnitude of κ is between 2.7 W/mK and 3.7 W/mK. Such a low thermal conductivity originates in complex structure: aperiodic in short length scale, that leads to frequent electron scattering (i.e. to low electronic contribution to the thermal conductivity), while large lattice constant defines a small Brillouin zone that enhances Umklapp scattering of extended phonons. Above 100 K non-extended (localized) lattice vibrations are thermally excited, the hopping gives a new heat carrying channel resulting in the typical increase of the thermal conductivity with temperature.

complex metallic alloys ; thermal conductivity ; spectral conductivity

The paper was published as a regular paper in a special issue of Croatica Chemica Acta dedicated to Professor Boran Leontić, where mostly papers presented at the international workshop "Frontiers in Complex Metallic Alloys". (cma2008.ifs.hr) were published.