Effect of Size Dispersity On the Melting Transition

Details Effect of Size Dispersity On the Melting Transition Effect of Size Dispersity On the Melting Transition

1997-03-05

arxiv.org/abs/cond-mat/9703054v1

Physics

Condensed Matter

Materials Science

5 pages, 7 postscript figures. To appear in the proceedings of 1996 MRS meeting in Boston. Includes artmrs.sty TeX sytle file

Scientific paper

We present a molecular dynamics simulation study of the liquid-solid transition in a two dimensional system consisting of particles of two different sizes interacting via a truncated Lennard-Jones potential. We work with equal number of particles of each kind and the dispersity $\Delta$ in the sizes of the particles is varied by changing the ratio of the particle sizes only. For the monodisperse case ($\Delta = 0$) and for small values of $\Delta$, we find a first order liquid-solid transition on increasing the volume fraction $\rho$ of the particles . As we increase $\Delta$, the first-order transition coexistence region weakens gradually and completely disappears at high dispersities around $\Delta = 0.10$ . At these values of dispersity the high density phase lacks long range translational order but possesses orientational order with a large but finite correlation length. The consequences of this effect of dispersity on the glass transition and on the melting transition in general are discussed.

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