Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 28, Issue 14, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/28/14/145401
Keywords
carbon; diamond; free energy; density functional theory; phase diagram; high pressure; anharmonic lattice
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [SPP 1488, SFB 652]
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Analytic free energy models for three solid high-pressure phases-diamond, body centered cubic phase with eight atoms in the unit cell (BC8), and simple cubic (SC)-are developed using density functional theory. We explicitly include anharmonic effects by performing molecular dynamics simulations and investigate their density and temperature dependence in detail. Anharmonicity in the nuclear motion shifts the phase transitions significantly compared to the harmonic approximation. Furthermore, we apply a thermodynamically constrained correction that brings the equation of state in accordance with diamond anvil cell experiments. The performance of our thermodynamic functions is validated against Hugoniot experiments.
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