A single solid homogeneous crystalline phase containing two or more chemical species.
Intermediate Solid Solution
A solid solution or phase having a composition range that does not extend to either of the pure components of the system.
Interstitial Solid Solution
A solid solution wherein relatively small solute atoms occupy interstitial positions between the solvent or host atoms.
Terminal Solid Solution
A solid solution that exists over a composition range extending to either composition extremity of a binary phase diagram.