Nanosecond formation of diamond and lonsdaleite by shock compression of graphite

The shock-induced transition from graphite to diamond has been of great scientific and technological interest since the discovery of microscopic diamonds in remnants of explosively driven graphite. Furthermore, shock synthesis of diamond and lonsdaleite, a speculative hexagonal carbon polymorph with unique hardness, is expected to happen during violent meteor impacts. Here, we show unprecedented in situ X-ray diffraction measurements of diamond formation on nanosecond timescales by shock compression of pyrolytic as well as polycrystalline graphite to pressures from 19 GPa up to 228 GPa. While we observe the transition to diamond starting at 50 GPa for both pyrolytic and polycrystalline graphite, we also record the direct formation of lonsdaleite above 170 GPa for pyrolytic samples only. Our experiment provides new insights into the processes of the shock-induced transition from graphite to diamond and uniquely resolves the dynamics that explain the main natural occurrence of the lonsdaleite crystal structure being close to meteor impact sites.

[1]  H. J. Lee,et al.  New experimental platform to study high density laser-compressed matter. , 2014, The Review of scientific instruments.

[2]  Roberto Car,et al.  Carbon phase diagram from ab initio molecular dynamics. , 2005, Physical review letters.

[3]  CLIFFORD FRONDEL,et al.  Lonsdaleite, a Hexagonal Polymorph of Diamond , 1967, Nature.

[4]  W. Gust.  Phase transition and shock-compression parameters to 120 GPa for three types of graphite and for amorphous carbon , 1980 .

[5]  John R. Johnson,et al.  Shock-synthesized hexagonal diamonds in Younger Dryas boundary sediments , 2009, Proceedings of the National Academy of Sciences.

[6]  K. Kondo,et al.  Predominant parameters in the shock‐induced transition from graphite to diamond , 1995 .

[7]  P. Buseck,et al.  Lonsdaleite is faulted and twinned cubic diamond and does not exist as a discrete material , 2014, Nature Communications.

[8]  D. B. Carlisle,et al.  Nanometre-size diamonds in the Cretaceous/Tertiary boundary clay of Alberta , 1991, Nature.

[9]  P. Decarli,et al.  Formation of Diamond by Explosive Shock , 1961, Science.

[10]  N. Pineau.  Molecular Dynamics Simulations of Shock Compressed Graphite , 2013 .

[11]  R. Wirth,et al.  New evidence of meteoritic origin of the Tunguska cosmic body , 2013 .

[12]  W. Nellis,et al.  Shock-induced martensitic phase transformation of oriented graphite to diamond , 1991, Nature.

[13]  Ji‐an Xu,et al.  Total energy calculations of the lattice properties of cubic and hexagonal diamond , 1998 .

[14]  M. Ross.  The ice layer in Uranus and Neptune—diamonds in the sky? , 1981, Nature.

[15]  E. Tosatti,et al.  Pressure-Induced Transformation Path of Graphite to Diamond. , 1995, Physical review letters.

[16]  W. Nellis,et al.  Shock-induced martensitic transformation of highly oriented graphite to diamond , 1992 .

[17]  F. Bundy,et al.  Hexagonal Diamonds in Meteorites: Implications , 1967, Science.

[18]  A. Kurdyumov,et al.  The influence of the shock compression conditions on the graphite transformations into lonsdaleite and diamond , 2012, Journal of Superhard Materials.

[19]  R. Hough,et al.  Diamond and silicon carbide in impact melt rock from the Ries impact crater , 1995, Nature.

[20]  E. Reed,et al.  Ultrafast transformation of graphite to diamond: an ab initio study of graphite under shock compression. , 2008, The Journal of chemical physics.

[21]  Michele Parrinello,et al.  Nucleation mechanism for the direct graphite-to-diamond phase transition. , 2011, Nature materials.

[22]  Shock-compressed graphite to diamond transformation on nanosecond time scales , 2013 .

[23]  W. Nellis,et al.  Carbon at pressures in the range 0.1–1 TPa (10 Mbar) , 2001 .

[24]  T. Kondo,et al.  Formation of high-pressure minerals in shocked L6 chondrite Yamato 791384: constraints on shock conditions and parent body size , 2004 .

[25]  F. P. Bundy,et al.  Hexagonal Diamond—A New Form of Carbon , 1967 .

[26]  C. Salzmann,et al.  Extent of stacking disorder in diamond , 2015, 1505.02561.

[27]  Yi Zhang,et al.  Harder than diamond: superior indentation strength of wurtzite BN and lonsdaleite. , 2009, Physical review letters.

[28]  F. Bundy,et al.  Preparation of Diamond , 1959, Nature.

[29]  S. Glenzer,et al.  The complex ion structure of warm dense carbon measured by spectrally resolved x-ray scatteringa) , 2015 .

[30]  I. Rattee.  Physical Chemistry of Pigments , 1968, Nature.

[31]  S. Louie,et al.  Structural and electronic properties of carbon in hybrid diamond-graphite structures , 2005 .

[32]  M. Roth,et al.  Probing the complex ion structure in liquid carbon at 100 GPa. , 2013, Physical review letters.

[33]  B. Militzer,et al.  A multiphase equation of state for carbon addressing high pressures and temperatures , 2013, 1311.4577.

[34]  Zhao,et al.  X-ray diffraction data for graphite to 20 GPa. , 1989, Physical review. B, Condensed matter.

[35]  K. Shimizu,et al.  Compression of polyhedral graphite up to 43 GPa and x-ray diffraction study on elasticity and stability of the graphite phase , 2004 .

[36]  Tao Yu,et al.  Mechanism for direct graphite-to-diamond phase transition , 2014, Scientific Reports.