Abstract
The thermal diffusivity D of three metallic glasses Fe80B20, Fe40Ni40P14B6, and Fe32Ni36Cr14P12B6 has been measured from 160 to 500 K by the laser-flash radiometry method and the thermal conductivity K has been calculated from these data. The accuracy of D and K is 6% and 8%, respectively. The electronic contribution (Ke) to the thermal conductivity, evaluated by using the Wiedemann–Franz law, increases almost linearly with increasing temperature. The phonon thermal conductivity Kph follows the temperature dependence exhibited by all amorphous dielectrics, i.e., Kph is roughly proportional to the phonon specific heat, thus giving an approximately constant phonon mean free path. When the metalloid atom B is replaced by P or the number of chemical components in the alloy is increased, both Ke and Kph decrease, but the drop in Kph is much more significant. The phonon mean free paths for Fe80B20 and Fe40Ni40P14B6 are 14 and 12 Å, respectively, which are substantially higher than the values (5–8 Å) for amorphous insulators.
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