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Using molecular dynamics simulations we study the thermodynamic behavior of asingle-component covalent material described by the recently proposedEnvironment-Dependent Interatomic Potential (EDIP). The parameterization ofEDIP for silicon exhibits a range of unusual properties typically found in morecomplex materials, such as the existence of two structurally distinctdisordered phases, a density decrease upon melting of the low-temperatureamorphous phase, and negative thermal expansion coefficients for both thecrystal (at high temperatures) and the amorphous phase (at all temperatures).Structural differences between the two disordered phases also lead to afirst-order transition between them, which suggests the existence of a secondcritical point, as is believed to exist for amorphous forms of frozen water.For EDIP-Si, however, the unusual behavior is associated not only with the opennature of tetrahedral bonding but also with a competition between four-fold(covalent) and five-fold (metallic) coordination. The unusual behavior of themodel and its unique ability to simulation the liquid/amorphous transition onmolecular-dynamics time scales make it a suitable prototype for fundamentalstudies of anomalous thermodynamics in disordeered systems.Comment: 48 pages (double-spaced), 13 figure

Thermodynamic behavior of a model covalent material described by the environment-dependent interatomic potential