爆轰诱导石墨向六方金刚石的相变
材料科学
2020-10-07 v1
摘要
我们利用 ns 时间尺度上的原位同步辐射 X 射线衍射研究了高定向热解石墨（HOPG）在爆轰诱导冲击条件下的结构演化。我们观察到在压力高于 50 GPa 时形成六方金刚石（lonsdaleite，朗斯代尔石），这与近期的气体炮实验在定性上一致。第一性原理密度泛函计算揭示，在单轴压缩下，向六方金刚石转变的能垒低于立方金刚石。最后，直至 >70 GPa 均未观察到立方金刚石形成的迹象。
引用
@article{arxiv.2007.11225,
title = {Detonation-induced transformation of graphite to hexagonal diamond},
author = {Elissaios Stavrou and Michael Bagge-Hansen and Joshua A. Hammons and Michael H. Nielsen and Bradley A. Steele and Penghao Xiao and Matthew P. Kroonblawd and Matthew D. Nelms and William L. Shaw and Will Bassett and Sorin Bastea and Lisa M. Lauderbach and Ralph L. Hodgin and Nicholas A. Perez-Marty and Saransh Singh and Pinaki Das and Yuelin Li and Adam Schuman and Nicholas Sinclair and Kamel Fezzaa and Alex Deriy and Lara D. Leininger and Trevor M. Willey},
journal= {arXiv preprint arXiv:2007.11225},
year = {2020}
}