Reporter: Prof. Dafang Li

(China Academy of Engineering Physics and the Beijing Computational Science Research Center)

Conference Chairperson: Wei Kang (Distinguished research fellow)

Time: 15th April, 2014, Tue. 12:10-14:00pm

Venue: Meeting Room 434, Mechanics Building

Speaker:

The expansion state of liquid metal is a very vital research that when the metals evolve into different states, the complicated transition among electrics, optics and thermodynamics will happen. Recently, by using the unified frame of QMD (Quantum-Molecular-Dynamics) method, we have explored the state equation and optical properties of Beryllium expansion, finding that the range of the liquid state temperature reaches 5000~30000K times the temperature of solid state, and its density range is 0.01~0.5 times the density of solid state. With the increasing density, the Many-body effect among particles gets more important, and the optical effect gradually becomes simple metal features from atomic fluid characters. Furthermore, we have calculated the average opacity of Rosseland in such state range. When compared with the outcomes of LEDCOP, we find that they match together in the low-density areas and produce the differences in the high-density areas because of the environment affection. It indicates the results of QMD can not only act as the standard of opacity database, but also develop of the database into warm dense matter area. Besides, the metal-nonmetal transition of Beryllium in the progress of thermal expansion will be discussed.