Equation Of State Of Liquid CO+N₂ Mixed Samples Under High-temperature And High-pressure

The understanding of the changing of material properties under extreme conditions is closely related to the modern high-pressure physics, weapons physics and astrophysics, etc. The condensed detonation products are mostly composed of carbon, hydrogen, nitrogen and oxygen elements, the condensed explosives are common engineering materials, as well as the essential conditions for conventional weapons research and development. Therefore, the study of small molecules composed of corresponding response to the detonation process and the equation of state of detonation products are quite meaningful. Based on liquid perturbation theory, C-J model , model potential theory and the principles of combined volume, etc., the C-H-O and C-N-O models are constructed to simulate more complex C-H-N-O model, the method has been proved to be effective. Research from the perspective of explosives detonation product equation, we hope that the result of detonation shock compression experiments contain the information of major components. CO and N₂ molecules are simple, their physical and chemical properties are very similar in normal state, they are all main components of condensed explosives, and they have been widely studied. In this paper, we chose the two substances and have studied the properties of liquid admixtures under high-temperature and high-density. By the international literature searches on line, these study results are innovative.The experiment part of this paper is to use the cryocondensation experimental tecniques (including the cryo-target, the photoelectric phase monitoring and the special cryo-coaxial electric detectors ), producing the homogeneous liquid CO+N₂ mixed samples with the requirements of shock-compression experiments. And then, mixed samples with the requirements of shock-compression experiments. And then, the high dynamic pressure tests of admixture with equal molar volume have been carried out on the two-stage light gas gun, Hugoniot data are compared with earlier results, it can be judged that phase transition may be occurred in the vicinity of 26GPa in the mixtures system. The first shock-compression spectrum signals of liquid C0-N2 mixed samples could provide evidence for illustrating the dissociation phase transition obtained by experiment and theory calculation.In the theory part of this paper, the modified liquid perturbation variational theory (MCRSR) and the improved van der Waals one-fluid model(vdW-1f) have been applied to calculate the dynamic equation of state of liquid CO and N₂ mixtures with different CO:N₂ compositions in the chemical equilibrium within 10-49GPa. The calculated results are well consistent with earlier experimental data within 10-26GPa, the average error of the shock pressure is 3.4%. Within the calculation pressure, the Hugoniot becomes "soften". The theoretical P-V curves and T-V curves with CO:N₂=1:4, 1:1,4:1 compositions have been obtained. The results show that pressures and temperatures are also decreasing gradually with the increase of the mole fraction of carbon monoxide composition.