Ab initio quality study of the graphite-diamond phase coexistence

Details Ab initio quality study of the graphite-diamond phase coexistence Ab initio quality study of the graphite-diamond phase coexistence

2010-02-15

arxiv.org/abs/1002.2910v3

Physics

Condensed Matter

Materials Science

5 pages, 2 figures, 1 table

Scientific paper

An interatomic potential for the diamond and graphite phases of carbon has been created using a neural-network (NN) representation of the ab initio potential energy surface. The NN potential combines the accuracy of a first-principle description of both phases with the efficiency of empirical force fields and allows one to perform, for the first time, a molecular dynamics study, of ab initio quality, of the thermodynamics of graphite-diamond coexistence. Good agreement between the experimental and calculated coexistence curves is achieved if nuclear quantum effects are included in the simulation.

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