1. Institution of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China; 2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; 3. Technology Development Center, Central Semiconductor Manufacturing Corporation, Wuxi 214000, China; 4. Department of Physics and Mathematics, Sichuan University of Science and Engineering, Zigong 643000, China
Abstract Thermodynamic and chemical properties of liquid carbon dioxide and nitrogen (CO2-N2) mixture under the conditions of extremely high densities and temperatures are studied by using quantum molecular dynamic (QMD) simulations based on density functional theory including dispersion corrections (DFT-D). We present equilibrium properties of liquid mixture for 112 separate density and temperature points, by selecting densities ranging from ρ =1.80 g/cm3to 3.40 g/cm3 and temperatures from T=500 K to 8000 K. In the range of our study, the liquid CO2-N2 mixture undergoes a continuous transition from molecular to atomic fluid state and liquid polymerization inferred from pair correlation functions (PCFs) and the distribution of various molecular components. The insulator-metal transition is demonstrated by means of the electronic density of states (DOS).
(Molecular dynamics calculations (Car-Parrinello) and other numerical simulations)
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11374217, 11135012, and 11375262) and the Joint Fund of the National Natural Science Foundation of China and the China Academy of Engineering Physics (Grant No. 11176020).
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