爆轰诱导石墨向六边形金刚石的转变

Bulletin of the American Physical Society Pub Date : 2020-03-03 DOI:10.1103/PHYSREVB.102.104116

E. Stavrou, M. Bagge-Hansen, J. Hammons, M. Nielsen, B. Steele, Penghao Xiao, M. Kroonblawd, Matthew D. Nelms, W. L. Shaw, Will P. Bassett, S. Bastea, L. Lauderbach, R. Hodgin, Nicholas A. Perez-Marty, Saransh Singh, P. Das, Yuelin Li, Adam W Schuman, N. Sinclair, K. Fezzaa, A. Deriy, L. Leininger, T. Willey

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引用次数: 5

摘要

利用同步x射线衍射在ns时间尺度上研究了高取向热解石墨(HOPG)在爆震条件下的结构演变。我们观察到六角形金刚石(lonsdaleite)在高于50 GPa的压力下的形成，与最近的气枪实验在定性上一致。第一性原理密度泛函计算表明，在单轴压缩下，向六边形金刚石过渡的能量势垒低于立方金刚石。最后，在GPa高达70美元时，没有观测到立方金刚石地层的迹象。

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Detonation-induced transformation of graphite to hexagonal diamond

We explore the structural evolution of highly oriented pyrolytic graphite (HOPG) under detonation-induced shock conditions using in situ synchrotron x-ray diffraction in the ns timescale. We observe the formation of hexagonal diamond (lonsdaleite) at pressures above 50 GPa, in qualitative agreement with recent gas gun experiments. First-principles density functional calculations reveal that under uniaxial compression, the energy barrier for the transition toward hexagonal diamond is lower than that for cubic diamond. Finally, no indication of cubic diamond formation was observed up to $g70$ GPa.

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Bulletin of the American Physical Society

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