Density anomalies and reentrant spinodal behavior *
نویسندگان
چکیده
A lattice model that displays anomalous density behavior and exhibits a reentrant spinodal is developed. This model is solved in the mean field approximation and the interrelation between density maxima and the reentrance of the spinodal is explicitly demonstrated. The limits of stability of the liquid phase are obtained at positive as well as negative pressures, and the nature of the limits of stability clarified. The interplay between local energy and local entropy is found to control the thermodynamics of the system.
منابع مشابه
Static and dynamic properties of stretched water
We present the results of molecular dynamics simulations of the extended simple point charge model of water to investigate the thermodynamic and dynamic properties of stretched and supercooled water. We locate the liquid–gas spinodal, and confirm that the spinodal pressure increases monotonically with T, supporting thermodynamic scenarios for the phase behavior of supercooled water involving a ...
متن کاملReentrant behavior of the spinodal curve in a nonequilibrium ferromagnet.
The metastable behavior of a kinetic Ising-type ferromagnetic model system in which a generic type of microscopic disorder induces nonequilibrium steady states is studied by computer simulation and a mean-field approach. We pay attention, in particular, to the spinodal curve or intrinsic coercive field that separates the metastable region from the unstable one. We find that, under strong nonequ...
متن کاملThe “puzzle” of Water Behavior at Low Temperature
Thermodynamic and transport properties of liquid water are not fully understood despite a large amount of research work both experimental and theoretical. The maximum of density and the enhanced anomalies observed at low temperatures are at the origin of several models that, in some cases, predict specific and unique behavior such as spinodal lines or critical points. We show that a careful ana...
متن کاملStability and instability of a hot and dilute nuclear droplet
The diabatic approach to collective nuclear motion is reformulated in the local-density approximation in order to treat the normal modes of a spherical nuclear droplet analytically. In a first application the adiabatic isoscalar modes are studied and results for the eigenvalues of compressional (bulk) and pure surface modes are presented as function of density and temperature inside the droplet...
متن کاملIncreasing the density melts ultrasoft colloidal glasses.
We use theory and simulations to investigate the existence of amorphous glassy states in ultrasoft colloids. We combine the hypernetted chain approximation with mode-coupling theory to study the dynamic phase diagram of soft repulsive spheres interacting with a Hertzian potential, focusing on low temperatures and large densities. At constant temperature, we find that an amorphous glassy state i...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1993