Thermal Conductivity and Thermal Diffusivity of Iron in the Temperature Range of 300–1700 K

Abstract

Abstract—Using the laser flash method, the thermal diffusivity (a) of carbonyl iron is measured in the temperature range of 300–1700 K with a detailed study of the critical region 980–1170 K. The initial experimental data in the field of magnetic phase transformation are processed by the scaling power law. The values of the critical indexes for thermal diffusivity (\(\gamma {\kern 1pt} ',\) γ) are obtained below and above the Curie temperature TС = 1048 ± 5 K: \(\gamma {\kern 1pt} '\) = 0.51 and γ = 0.35, which in absolute value significantly exceed the value of the characteristic critical index for the heat capacity (γ ≈ –0.1). The thermal conductivity (λ) is calculated from measured data of the thermal diffusivity. The results are compared with the known literature data, special attention is paid to the behavior of the curves a(T), λ(T) in the region of the magnetic phase transformation. A table of recommended temperature dependences for a and λ along with estimated errors has been developed.