Nanoporous nanocrystalline impact diamonds

  • Tatyana ShumilovaEmail author
  • Sergey Isaenko
Original Paper


Complementary nano- and atomic-scale data from SEM, FIB, HRTEM, and EELS observations of after-coal impact diamonds from the giant Kara astrobleme are described, presenting their particular nano-sized porous polycrystalline structure, which consists of well-shaped single 20-30 nm nanocrystals that are free of deformation defects and do not contain lonsdaleite. The porous micro- and nanostructure is a special typomorphic feature of after-coal diamonds that suggests a crystallisation mechanism through short distance diffusion. The data for the after-coal impact diamonds presented here demonstrate their distinguishing characteristics from after-graphite impact diamonds, and have some similarity with the enigmatic carbonado, providing new insights to the origin of the latter.


Nanostructure HRTEM SEM/FIB Carbon materials Nanocrystalline diamond Impact products 



The authors wish to thank F. Langenhorst, K. Pollok, and D. Harries for help with the SEM/FEIB/TEM studies, V.L. Masaitis for scientific consultations and discussions, the all-Russian field team members for help in the expedition, E.V. Susol for technical assistance; and S.S. Shevchuk, B.A. Makeev for preliminary analytical studies of the impact diamonds. T.Sh. thanks the DAAD foundation for financial support to visit the Jena University. We are grateful to an anonymous reviewer for advice on improving the paper. The work has been supported by the RFBR Project No. 17-05-00516 with partial support of the NIR No. AAAA-A17-117121270036-7.


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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of Geology, Komi Scientific Centre of Ural DivisionRussian Academy of SciencesSyktyvkarRussia
  2. 2.Hawaii Institute of Geophysics and PlanetologyUniversity of Hawaii at ManoaHonoluluUSA

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