Establishment of pressure scale based on shock-compression experiment

在本研究中，我们重新测量了压力标物质的Hugoniot数据，以修正压力标，并进一步重新考虑地球内部的结构。用斜镜法结合粉末枪和二级轻气枪测量了100 GPa以上压力范围内的Hugoniot数据。通过使用长脉冲染料激光器和与枪相结合的镜旋转型条纹，我们将测量精度提高了10倍。测量了Au和MgO的Hugoniot数据。我们测量了Cu、Ta、W三种压力标材料的Hugoniot数据，并将其用于飞片和驱动片，以在没有LosaAlamos数据的情况下进行Hugoniot测量。结果表明，Au、Cu、W的冲击波速度略大于Los Alamos的数据，而Ta的冲击波速度与Los Alamos的数据一致。MgO的冲击波速度也略大于Las Alamos的数据在塑性区的粒子速度> 1公里/秒。另一方面，发现Gd_3Ga_5O_2<12>在65 GPa时开始向高压相转变，其阻抗比金刚石大。通过与静态压缩研究人员的合作，取得了以下成果：GaN在静态压缩下的相变，Pt，Ir，Fe等与水在高温高压下的化学反应，NaCl的精确状态方程的MD模拟等。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.