Establishment of pressure scale based on shock-compression experiment

在这项研究中，我们重新测量了压力标度材料的Hugoniot数据，以修正压力标度，并进一步重新考虑地球内部的结构。用斜镜法结合火药枪和二级轻气炮测量了Hugoniot数据，压力范围达100 Gpa以上。我们使用长脉冲染料激光和反射镜旋转式条纹与枪相结合，将测量精度提高了10倍。我们测量了Au和MgO的Hugoniot数据。在没有洛萨·阿拉莫斯数据的情况下，我们测量了用于飞板和驱动板的压力型材料--铜、钽、钨的Hugoniot数据。结果表明，Au、Cu、W的激波速度略大于Los Alamos资料，而Ta的激波速度与LosAlamos资料一致。在&GT；1公里/S的塑性区，氧化镁的冲击波速度也略大于拉斯阿拉莫斯的数据。另一方面，Gd_3Ga_5O_(12)在65 GPa时开始向阻抗大于金刚石的高压相转变。通过与静态压缩研究者的合作，得到了以下结果：GaN在静态压缩下的相变，高温高压下铂、Ir、Fe等与水的化学反应，用分子动力学模拟得到了氯化钠的精确状态方程等。我们一直在分析铜、钽、钨、氧化镁等的状态方程，以便将这些数据应用于地球内部的问题。

In this study, we re-measured the Hugoniot data of pressure-scale materials to revise the pressure scales, and further to reconsider the structure of the earth interior. The Hugoniot data were measured in the pressure range up to over 100 GPa by the inclined-mirror method combined with a powder gun and a two-stage light gas gun. We increased the measurement accuracy by 10 times higher than the Los Alamos data by using a long-pulsed dye laser and a mirror rotating type streak came combined with the guns. We have measured the Hugoniot data of Au and MgO. We measured the Hugoniot data of Cu, Ta, W, which are pressure-scale materials and used for the flyer plate and driver plate to perfor the Hugoniot measurements without Losa Alamos data. As a result, the shock velocities of Au, Cu, W were slightly larger than the Los Alamos data, while those of Ta were consistent with. The shock velocities of MgO were also slightly larger than the Las Alamos data in the plastic region of > 1 km/s in particle velocity. On the other side, it was found that Gd_3Ga_5O_<12> began to transform at 65 GPa to the high-pressure phase whose impedance was larger than diamond. By the collaborations with the static compression researchers, the following results have been got : the phase transition of GaN under static compression, The chemical reactions of Pt, Ir, Fe, etc. with water under high-temperature and high pressure, the precise EOS of NaCl by the MD simulation, and so on. We have been analyzing the equations of state of Cu, Ta, W, MgO, etc., to apply those data to earth-interior problems.