Thin film interdiffusion of Au and In at room temperature

Results on the thin film interdiffusion of Au and In at room temperature are presented. Indium films 56–3000 Å thick were deposited by vacuum evaporation onto previously deposited gold films of thicknesses ranging from 200 to 1600 Å. The interdiffusion of Au and In occurs quickly at room temperature and the intermetallic compounds AuIn₂, AuIn, Au₇In₃ and Au₄In are formed. Which compound will be formed depends on the Au:In ratio in the layer and on the diffusion time.