| Autor: |
Altabet, Y. Elia, Stillinger, Frank H., Debenedetti, Pablo G. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 2016, Vol. 145 Issue 21, p1-14, 14p, 2 Color Photographs, 3 Diagrams, 11 Graphs |
| Abstrakt: |
In particle systems with cohesive interactions, the pressure-density relationship of the mechanically stable inherent structures sampled along a liquid isotherm (i.e., the equation of state of an energy landscape) will display a minimum at the Sastry density pS. The tensile limit at pS is due to cavitation that occurs upon energy minimization, and previous characterizations of this behavior suggested that pS is a spinodal-like limit that separates all homogeneous and fractured inherent structures. Here, we revisit the phenomenology of Sastry behavior and find that it is subject to considerable finite-size effects, and the development of the inherent structure equation of state with system size is consistent with the finite-size rounding of an athermal phase transition. What appears to be a continuous spinodal-like point at finite system sizes becomes discontinuous in the thermodynamic limit, indicating behavior akin to a phase transition. We also study cavitation in glassy packings subjected to athermal expansion. Many individual expansion trajectories averaged together produce a smooth equation of state, which we find also exhibits features of finite-size rounding, and the examples studied in this work give rise to a larger limiting tension than for the corresponding landscape equation of state. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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