Transport Properties of Polycrystalline Ni sub 3 Al

摘要

The room-temperature electrical and thermal conductivities of annealed high purity samples coantaining 74 to 76 at.% Ni are presented and compared to theoretical predictions. Residual (4.2 exp 0 K) electrical resistivity data are also employed in the analysis and these results show a pronounced minimum at the stoichiometric composition. The data show that the thermal conductivity of this compound is quite sensitive to stoichiometry and, at room temperaure, has a maximum value at about 74.8 at.% Ni. Calculated and experimentally derived phonon thermal conductivity values agree well, and indicate that this carrier is responsible for about 25% of the room temperature thermal conductivity. The electronic Lorenz function is essentially equal to the Sommerfeld value. (ERA citation 09:000765)