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Effect of Size Dispersity on the Melting Transition

Published online by Cambridge University Press:  10 February 2011

M. R. Sadr-Lahijany ,
P. Ray ,
S. T. Harrington  and
H. E. Stanley
M. R. Sadr-Lahijany
Affiliation:
Center for Polymer Studies and Department of Physics, Boston University, Boston, MA, 02215, USA
P. Ray
Affiliation:
The Institute of Mathematical Sciences, CIT Campus, Madras - 600 113, India
S. T. Harrington
Affiliation:
Center for Polymer Studies and Department of Physics, Boston University, Boston, MA, 02215, USA
H. E. Stanley
Affiliation:
Center for Polymer Studies and Department of Physics, Boston University, Boston, MA, 02215, USA
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Abstract

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 Δ in the sizes of the particles is varied by changing the ratio of the particle sizes only. For the monodisperse case (Δ = 0) and for small values of Δ, we find a first order liquid-solid transition on increasing the volume fraction p of the particles. As we increase Δ, the first-order transition coexistence region weakens gradually and completely disappears at high dispersities around Δ = 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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 455: Symposium T – Glasses and Glass Formers–Current Issues , 1996 , 447
Copyright
Copyright © Materials Research Society 1997

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References

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