Structure of the Diamond-lonsdaleite System

A High-Resolution Electron Microscopy (HREM) Study

Hexagonal diamond or lonsdaleite (2H) is a new form of carbon which was found in meteorites [1]. For the first time it was obtained artificially [2] under conditions of static pressure exceeding 13 GPa and temperature greater than 1000 °C. Hexagonal diamond differs from the cubic one (3C) by the layers stacking. Crystal lattice of cubic diamond represent itself a sequence of atomic layers ABCABC..., whereas lonsdaleite lattice represents ABAB... stacking. Further, lonsdaleite was obtained mostly as a result of thermobaric treatment of carbon materials (for example, from graphite [3]). Britun V. et al. examined lonsdaleite obtained from graphite in high pressure chamber, and they have established that lonsdaleite is metastable martensite phase of carbon [4]. In [5] authors have synthesized nanocrystalline cubic diamond powder from C60, which contained lonsdaleite layers. Also diamond particularly was transformed into lonsdaleite during the diamond powder annealing [6].

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This work was supported by the Ministry of Education and Science of Russian Federation within the framework of state contract N_o 12.527.12.5003.

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Dr Boris A Kulnitskiy
(corresponding author via e-mail request)
Dr Igor A Perezhogin
Prof Dr Vladimir Blank

Technological Institute for Superhard and Novel Carbon Materials
Troitsk, Moscow, Russia


Technological Institute for Superhard and Novel Carbon Materials
7a Centralnaya
142190 Troitsk, Moscow

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