Anomalous Scenario for Termination of Metastable Melting in Simplified Coulomb Models in the Zero-Temperature Limit



Two non-standard scenarios of melting termination in deep metastable states are studied in the zero-temperature limit on the base of two variants of modified one-component Coulomb models. These additional scenarios supplement the previously studied standard case of “spinodal decomposition” (Iosilevskiy and Chigvintsev, arXiv:0609059) when liquid binodal of metastable freezing (liquidus) is terminated in intersection with gas-liquid spinodal. In the first new scenario hypothetical unique crystal-fluid global phase coexistence is realized as smooth superposition of melting and sublimation transitions (without gas-liquid transition and corresponding critical point). The second new type of “spinodal decomposition” scenario is related to the situation when solid binodal of metastable melting (solidus) intersects spinodal of metastable isostructural crystal-crystal phase transition. Modified one-component Coulomb models allow one to investigate in details all features of such “spinodal decomposition” scenarios (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)