From the Ising model and the Lennard-Jones fluid to water and the iron-carbon system, phase diagrams are an indispensable tool to understand phase equilibria. Despite the effort of the simulation community, the calculation of a large portion of a phase diagram using computer simulation is still today a significant challenge. Here, we propose a method to calculate phase diagrams involving liquid and solid phases by the reversible transformation of the liquid and the solid. To this end, we introduce an order parameter that breaks the rotational symmetry and we leverage our recently introduced method to sample the multithermal-multibaric ensemble. In this way, in a single molecular dynamics simulation, we are able to compute the liquid-solid coexistence line for entire regions of the temperature and pressure phase diagram. We apply our approach to the bcc-liquid phase diagram of sodium and the fcc-bcc-liquid phase diagram of aluminum.
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Calculation of phase diagrams in the multithermal-multibaric ensemble
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28 June 2019
Research Article|
June 28 2019
Calculation of phase diagrams in the multithermal-multibaric ensemble
Pablo M. Piaggi
;
Pablo M. Piaggi
1
Department of Chemistry and Applied Biosciences, ETH Zurich, c/o USI Campus
, Via Giuseppe Buffi 13, CH-6900, Lugano, Switzerland
2
Facoltà di Informatica, Istituto di Scienze Computazionali, and National Center for Computational Design and Discovery of Novel Materials (MARVEL), Università della Svizzera italiana (USI)
, Via Giuseppe Buffi 13, CH-6900, Lugano, Switzerland
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Michele Parrinello
Michele Parrinello
a)
1
Department of Chemistry and Applied Biosciences, ETH Zurich, c/o USI Campus
, Via Giuseppe Buffi 13, CH-6900, Lugano, Switzerland
2
Facoltà di Informatica, Istituto di Scienze Computazionali, and National Center for Computational Design and Discovery of Novel Materials (MARVEL), Università della Svizzera italiana (USI)
, Via Giuseppe Buffi 13, CH-6900, Lugano, Switzerland
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a)
Electronic mail: parrinello@phys.chem.ethz.ch
J. Chem. Phys. 150, 244119 (2019)
Article history
Received:
April 24 2019
Accepted:
June 04 2019
Citation
Pablo M. Piaggi, Michele Parrinello; Calculation of phase diagrams in the multithermal-multibaric ensemble. J. Chem. Phys. 28 June 2019; 150 (24): 244119. https://doi.org/10.1063/1.5102104
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