The bridge functions of molten salts

The bridge functions of molten NaCl and AgI near melting were obtained by u sing the model potentials of Born-Huggins-Mayer for NaCl and Vashishta-Rahm an for AgI. The calculations of the bridge functions involved molecular dyn amics simulations, the extension of the procedure originally proposed by Po ll [Phys. Rev. A 37, 1672 (1988)] and the numerical solution of the Ornstei n-Zernike equations. The calculated bridge functions do not conform with th e universality ansatz. They also differ from the bridge functions obtained for model electrolytes. Following the results obtained for electrolytes and those of this work for molten salts, it is conjectured that the universali ty ansatz for the bridge functions does not apply for systems whose attract ive interactions play a decisive role in their structural ordering. (C) 200 1 American Institute of Physics.