Interdiffusion and phase formation at room temperature in evaporated gold-tin films

Interdiffusion at room temperature in evaporated Au-Sn films was studied by the in situ backscattering of 2.0 MeV ⁴He ions. The interdiffusion resulted in the formation and growth of an AuSn phase region. The growth of the phase followed a parabolic growth rate law, and the growth rate constant was found to be about 9 × 10^?15 cm²s^?1 at room temperature.