Phase diagram of silicon from atomistic simulations

Details Phase diagram of silicon from atomistic simulations Phase diagram of silicon from atomistic simulations

2005-02-25

arxiv.org/abs/cond-mat/0502619v1

Phys. Rev. Lett vol 94, 095701 (2005)

Physics

Condensed Matter

Materials Science

5 pages, 1 figure, accepted in PRL

Scientific paper

10.1103/PhysRevLett.94.095701

In this letter we present a calculation of the temperature-pressure phase diagram of Si in a range of pressures covering from -5 to 20 GPa and temperatures up to the melting point. The phase boundaries and triple points between the diamond, liquid, $\beta$-Sn and ${Si}_{34}$ clathrate phases are reported. We have employed efficient simulation techniques to calculate free energies and to numerically integrate the Clausius-Clapeyron equation, combined with a tight binding model capable of an accuracy comparable to that of first-principles methods. The resulting phase diagram agrees well with the available experimental data.

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