Phase Properties and Transport Processes in Dense Multi-Ionic-Mixture Plasmas

1.初步研究首席研究员与研究人员合作，于1986年撰写了一篇关于稠密等离子体统计物理的综述文章，并发表在《物理报告》上。经典单组分等离子体晶化的非线性密度泛函方法在改进的流体关联函数超网链近似的基础上，发展了将经典单组分等离子体冻结为体心立方晶体的密度泛函方法。通过微观计算阐明了三体关联或角关联的作用。从而得到了冻结的简化密度波理论。白矮星中致密碳-氧混合物的热力学函数、冻结转变和相图通过蒙特卡罗模拟、相关积分方程解和密度泛函形式的变分计算，研究了适合于白矮星内部的致密碳-氧二元离子混合物(BIM)的状态方程。结果表明，C-O BIM固体和流体的内能均严格服从线性混合公式。然后，我们给出了这种BIM材料中与冻结转变相关的相图的准确计算，导致了对共沸图的新的预测。对共沸相界面质量密度的不连续性进行了数值计算，用于白矮星演化的研究。

1. Preliminary StudyThe head investigator in collaboration with the investigators wrote a review article on the statistical physics of dense plasmas in 1986 and published it in Physics Reports.2. Nonlinear Density-Functional Approach to the Crystallization of the Classical One-Component PlasmaThe density-functional approach to freezing of the classical one-component plasma into a bcc crystal was developed on the basis of the improved hypernetted-chain approximation to the fluid correlation functions. The role of the threebody or angu-lar correlations was elucidated through microscopic calculations. We thereby obtained a simplified density-wave theory of freezing.3. Thermodynamic Functions, Freezing Transition, and Phase Diagram of Dense Carbon-Oxygen Mixtures in White DwartsEquations of state for dense carbon-oxygen (C-O) binary-ionic mixtures (BIM's) appropriate to the interiors of white dwarfs were investigated through Monte Carlo simulations, by solution to relevant integral equations, and by variational calculations in the density-functional formalism. It was thereby shown that the internal energies of the C-O BIM solids and fluids both obeyed precisely the linear mixing formulas. We then presented an accurate calculation of the phase diagram associated with freezing transitions in such BIM materials, resulting in novel prediction of an azeotropic diagram. Discontinuities of the mass density across the azeotropic phase boundaries were evaluated numerically for application to a study of white-dwarf evolution.