HRTEM study of Popigai impact diamond: heterogeneous diamond nanostructures in native amorphous carbon matrix |
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| Authors: | Viktoria K Kis Tatyana Shumilova Victor Masaitis |
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| Institution: | 1.Institute of Technical Physics and Materials Science,Centre for Energy Research, HAS,Budapest,Hungary;2.Institute of Geology of Komi Science Center of Ural Branch of RAS,Syktyvkar,Russia;3.Hawaii Institute of Geophysics and Planetology,University of Hawaii at Manoa,Honolulu,USA;4.Federal State Unitary Enterprise A. P. Karpinsky Russian Geological Research Institute,St. Petersburg,Russia |
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| Abstract: | High-resolution transmission electron microscopy was applied for the detailed nanostructural investigation of Popigai impact diamonds with the aim of revealing the nature of the amorphous carbon of the matrix. The successful application of two complementary specimen preparation methods, focused ion beam (FIB) milling and mechanical cleavage, allowed direct imaging of nanotwinned nanodiamond crystals embedded in a native amorphous carbon matrix for the first time. Based on its stability under the electron beam, native amorphous carbon can be easily distinguished from the amorphous carbon layer produced by FIB milling during specimen preparation. Electron energy loss spectroscopy of the native amorphous carbon revealed the dominance of sp 2-bonded carbon and the presence of a small amount of oxygen. The heterogeneous size distribution and twin density of the nanodiamond crystals and the structural properties of the native amorphous carbon are presumably related to non-graphitic (organic) carbon precursor material. |
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