Experimental observation of open structures in elemental magnesium at terapascal pressures-猫眼课题宝

DOI：

10.1038/s41567-022-01732-7

发表时间：

2022-09

期刊：

Nature Physics

影响因子：

19.6

通讯作者：

中科院分区：

物理与天体物理1区

文献类型：

作者：

M. Gorman;S. Elatresh;A. Lazicki;M. Cormier;S. Bonev;D. McGonegle;R. Briggs;A. Coleman;S. Rothman;L. Peacock;J. Bernier;F. Coppari;D. Braun;J. R. Rygg;D. Fratanduono;R. Hoffmann;G. Collins;J. Wark;R. Smith;J. Eggert;M. McMahon

研究固体物质在巨大压力下的行为，例如在巨行星内部深处发现的压力，是一个巨大的实验挑战。在过去的十年里，计算预测表明，压缩到万亿帕斯卡的压力可能会带来反直觉的变化，在结构和固体的键合量子力学力的影响增长，-。虽然在中等压力下在高度可压缩的轻碱金属中观察到这种行为，但尚未确定它是否在更广泛的高压固体中是普遍的。我们在国家点火设施中使用成形激光脉冲将元素Mg压缩到1.3 TPa，这大约是地球核心压力的四倍。通过使用纳秒持续时间的X射线衍射直接探测晶体结构，我们发现Mg在最高压力下多次改变其晶体结构，出现非紧密堆积相。我们的研究结果表明，极端凝聚态物质的相变，以前只能通过理论计算，现在可以实验探索。

Investigating how solid matter behaves at enormous pressures, such as those found in the deep interiors of giant planets, is a great experimental challenge. Over the past decade, computational predictions have revealed that compression to terapascal pressures may bring about counter-intuitive changes in the structure and bonding of solids as quantum mechanical forces grow in influence, , , , –. Although this behaviour has been observed at modest pressures in the highly compressible light alkali metals,, it has not been established whether it is commonplace among high-pressure solids more broadly. We used shaped laser pulses at the National Ignition Facility to compress elemental Mg up to 1.3 TPa, which is approximately four times the pressure at the Earth’s core. By directly probing the crystal structure using nanosecond-duration X-ray diffraction, we found that Mg changes its crystal structure several times with non-close-packed phases emerging at the highest pressures. Our results demonstrate that phase transformations of extremely condensed matter, previously only accessible through theoretical calculations, can now be experimentally explored.

Experimental observation of open structures in elemental magnesium at terapascal pressures

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