Electrical and thermal conductivity of FeNi at low temperatures
The temperature dependences in the range of 4.2-300 K were studied for the electrical resistance and thermal conductivity of a Fe-Ni equiatomic system sample obtained from nickel and iron powders by electroconsolidation for 10 min at the temperature of 1100 °C, the pressure of 35 MPa and the current of ~ 5 kA. It was found that the electrical and thermal conductivity of an electroconsolidated sample is significantly higher than that of samples of the same composition obtained by melting. It was found that the temperature dependence of the electrical resistance of the electroconsolidated sample in the studied range of 4.2-300 K are due to electron scattering by defects and phonons, and the electron scattering by phonons can be approximated with high accuracy by the Bloch-Grüneisen-Wilson relation.