Establishment of pressure scale based on shock-compression experiment

在本研究中，我们重新测量了压力尺度材料的Hugoniot数据，以修正压力尺度，并进一步重新考虑地球内部的结构。Hugoniot数据在100 GPa以上的压力范围内通过斜镜法结合粉末枪和二级光气枪进行测量。我们通过使用长脉冲染料激光和镜面旋转型条纹与枪相结合，将测量精度提高了洛斯阿拉莫斯数据的10倍。我们测量了Au和MgO的Hugoniot数据。我们测量了Cu， Ta， W的Hugoniot数据，这是压力刻度材料，用于飞行板和驱动板进行Hugoniot测量，没有洛萨阿拉莫斯的数据。因此，Au、Cu、W的激波速度略大于Los Alamos的数据，而Ta的激波速度与Los Alamos的数据一致。MgO的激波速度也略大于Las Alamos的数据，在颗粒速度为>.1 km/s的塑性区。另一方面，发现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人员的合作，得到了GaN在静态压缩下的相变，Pt、Ir、Fe等在高温高压下与水的化学反应，NaCl在MD模拟下的精确EOS等结果。我们一直在分析Cu， Ta， W， MgO等的状态方程，将这些数据应用于地球内部问题。

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.