Abstract
It is commonly believed that melting occurs when mean square displacement (MSD) of a particle of crystalline solid exceeds a threshold value. This is known as the Lindemann criterion, first introduced in the year of 1910 by Lindemann. However, Chakravarty et al., demonstrated that this common wisdom is inadequate because the MSD at melting can be temperature dependent when pressure is also allowed to vary along the coexistence line of the phase diagram [Chakravarty C, Debenedetti P G and Stillinger F H 2007 J. Chem. Phys. 126 204508]. We show here by extensive molecular dynamics simulation of both two and three dimensional polydisperse Lennard-Jones solids that particles on the small and large limits of size distribution exhibit substantially different Lindemann ratio at melting. Despite all the dispersion in MSD, melting is found to be first order in both the dimensions at 5–10% dispersity in size. Sharpness of the transition is incommensurate with the different rate of growth of MSD. The increased MSD values of smaller particles play a role in the segregation of them prior to melting.
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Acknowledgements
This paper is dedicated to the memory of Prof. Charusita Chakravarty who was a respected colleague, valued friend and highly admired person. We and Indian science shall miss her dearly.
We would like to thank Prof. Stuart A. Rice from the University of Chicago for scientific discussions. This work was supported in parts by grants from DST, BRNS and CSIR (India). B.B. thanks DST for support through J. C. Bose Fellowship. S. S. and C. J. contributed equally.
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In order to ascertain that segregation happens just before melting, we have shown two snapshots from equilibrated samples (as shown in Figures ?? and ??) deep in the solid phase of three dimensional polydisperse system. It is interesting to note that no obvious segregation pattern is found.
Special Issue on THEORETICAL CHEMISTRY/CHEMICAL DYNAMICS
Dedicated to the memory of the late Professor Charusita Chakravarty
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SARKAR, S., JANA, C. & BAGCHI, B. Breakdown of universal Lindemann criterion in the melting of Lennard-Jones polydisperse solids. J Chem Sci 129, 833–840 (2017). https://doi.org/10.1007/s12039-017-1245-y
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DOI: https://doi.org/10.1007/s12039-017-1245-y