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Mechanism of formation of the superhard disordered graphite-like phase from fullerite C60 under pressure

Tat'yanin, E V and Lyapin, A G and Mukhamadiarov, V V and Brazhkin, V V and Vasiliev, A L (2005) Mechanism of formation of the superhard disordered graphite-like phase from fullerite C60 under pressure. Journal of Physics: Condensed Matter, 17 (2). pp. 249-256.

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Official URL: http://stacks.iop.org/0953-8984/17/249

Abstract

Comparing the transmission electron microscopy and x-ray diffraction data for a disordered graphite-like (sp2-bonded) carbon phase (DGCP) synthesized from fullerite C60 at high temperatures in the pressure interval from 1.5 to 8 GPa, we show that the nanocluster structure, long-range correlations for orientation of clusters, lamellar and tweed morphology, and possible macroscopic anisotropy are intrinsic properties of the DGCP, and that they can be recognized as a signature of stresses in the parent phase at different scales from the atomic level (atomic density modulation) to the macroscopic one (non-hydrostatic pressure environment). These data indicate that the mechanism of the formation of the DGCP from large-molecule crystalline carbon material, such as C60, is quite uncommon in the standard classification for the first-order phase transitions since it displays features typical for both diffusion and martensitic mechanisms, e.g., a strong topological rearrangement of covalent bonds and a crystallographic-like relation between crystalline parent and disordered product phases, respectively.

Item Type:Article
ID Code:5470
Deposited By:Prof. Alexey Ivanov
Deposited On:06 Feb 2010 11:11
Last Modified:06 Feb 2010 11:53

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