Electrical and thermal conductivity of FeNi at low temperatures

The electrical resistivity and thermal conductivity as functions of temperature, for an equiatomic Fe–Ni system are studied. The samples were obtained from nickel and iron powders by a 10 min electroconsolidation at a temperature of 1100 °C, pressure 35 MPa, and current ∼5 kA, and studied in the range of 4.2–300 K. It was found that the electrical and thermal conductivity of the electroconsolidated sample is significantly higher than that of samples with the same composition, obtained by melting. It was revealed that in the investigated range of 4.2–300 K, an electroconsolidated sample’s resistivity as a function of temperature is determined by electrons scattering by defects and phonons, and the scattering of electrons by phonons can be approximated with high accuracy by the Bloch–Grüneisen–Wilson formula.