Abstract: The coefficient of linear expansion, the structure of AgAlGe and theinterface structure of molybdenum to silicon bonded by alloy Ag₂₄Al₄₃Ge₃₃ were studied by means of thermomechanicalanalysis, x-ray diffraction and SEM. The effect of silver on thestructural characteristics were also investigated. The results showedthat the coefficient of linear expansion of AgAlGe is close to that ofsilver. The existence of Ag₂Al, Al, Ge on the interface of Si-Mocontact raised the melting temperature of the interface andsuppressed the corrosion of silicon.