Incommensurate–commensurate transition driven by concentration in rare gas mixtures adsorbed on graphite

Abstract An unexpected anomaly is observed in the phase diagram of argon‐xenon and krypton‐xenon mixtures adsorbed on graphite: less krypton than argon is needed to drive the incommensurate–commensurate transition. A mean lattice model is developed, which describes the krypton‐xenon mixture, however, local disorder terms must be added to obtain agreement with the argon‐xenon results.