Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
Sandia National Laboratories, Albuquerque, NM 87185-1195, USA.
Science. 2021 Jun 4;372(6546):1063-1068. doi: 10.1126/science.abh0364.
New techniques are advancing the frontier of high-pressure physics beyond 1 terapascal, leading to new discoveries and offering stringent tests for condensed-matter theory and advanced numerical methods. However, the ability to absolutely determine the pressure state remains challenging, and well-calibrated pressure-density reference materials are required. We conducted shockless dynamic compression experiments at the National Ignition Facility and the Z machine to obtain quasi-absolute, high-precision, pressure-density equation-of-state data for gold and platinum. We derived two experimentally constrained pressure standards to terapascal conditions. Establishing accurate experimental determinations of extreme pressure will facilitate better connections between experiments and theory, paving the way toward improving our understanding of material response to these extreme conditions.
新技术正在将高压物理学的前沿推进到 1 太帕斯卡以上，带来新的发现，并为凝聚态理论和先进的数值方法提供严格的测试。然而，绝对确定压力状态的能力仍然具有挑战性，需要经过良好校准的压力-密度基准材料。我们在国家点火装置和 Z 机器上进行了无冲击波动态压缩实验，以获得金和铂的准绝对、高精度压力-密度状态方程数据。我们得出了两个实验约束的压力标准，达到太帕斯卡条件。建立对极端压力的准确实验测定将有助于在实验和理论之间建立更好的联系，为提高我们对材料在这些极端条件下的反应的理解铺平道路。
