The heat diffusivity of solid solutions of silicon and germanium in nickel

The concentration and temperature dependences are given of the heat diffusivity of solid solutions of silicon and germanium in nickel in the temperature range from $295$ to $1400$ K. The behavior of heat diffusivity is investigated for these systems in the neighborhood of the Curie point. The critical exponent, which describes the behavior of curve $a(T)$, is shown to be sensitive to the presence of admixtures.