Welcome to Alloy Phase Diagram Database™

An intermediate phase is a distinguishable homogeneous phase whose composition range does not extend to any of the pure components of the system. Intermetallic compounds are intermediate phases, containing two or more metals, that usually have compositions, and specific crystal structures different from those of the pure components of the system. They generally have a very limited composition range, and often are described as "line compounds" because they appear as vertical lines on the phase diagram. The Ag-Sr diagram shown here has five intermetallic compounds: SrAg₅, SrAg₄, SrAg₂, SrAg, and Sr₃Ag₂, each of which has a specific, fixed composition. Of these intermetallic compounds, only SrAg₅ displays some solubility with the silver terminal solid solution. Intermetallic compounds have unique melting points and therefore behave like pure elements.