Microstructural mapping of C60 phase transformation into disordered graphite at high pressure, using X-ray diffraction microtomography
authors Alvarez-Murga, M; Bleuet, P; Marques, L; Lepoittevin, C; Boudet, N; Gabarino, G; Mezouar, M; Hodeau, JL
nationality International
journal JOURNAL OF APPLIED CRYSTALLOGRAPHY
author keywords diffraction tomography; imaging; texture; two-dimensional polymerized C60; disordered graphite; carbon
keywords FULLERITE C-60; SINGLE-CRYSTAL; STRUCTURAL REFINEMENT; POLYMERIZED FULLERITE; HIGH-TEMPERATURE; SOLID C-60; CARBON; SYNCHROTRON; TOMOGRAPHY; FULLERENES
abstract An extended use of synchrotron-based X-ray diffraction microtomography (XRD-mu CT) to study simultaneously the phase distribution and microstructure in phase-transformation processes is proposed. This three-dimensional non-invasive imaging approach has been applied to understand the phase transformation of C60 rhombohedral polymer (C60R) into disordered graphite (DG) at high pressure and high temperature. The heterogeneous sample was synthesized (5 GPa, 1100 K) using a Paris-Edinburgh cell and selective image reconstructions were achieved for all different phases present in this sample. The XRD-mu CT analysis evidences elongated DG domains with a fiber texture where nested (002)(DG) planes show +/- 70 degrees preferential orientation relative to the compression axis. In contrast C60R domains are found to be small and spotty, preferentially in the middle of the sample. The parent and product phases are mutually interpenetrative and exhibit a crystallographic relationship. This study evidences that formation of (002)(DG) planes occurs parallel to {111}(C60C) pseudo-cubic planes. Among these four possible alignments, uniaxial pressure favors one [111](C60C) direction. Transmission electron microscopy observations validate these nondestructive XRD-mu CT results.
publisher WILEY-BLACKWELL
issn 0021-8898
year published 2011
volume 44
beginning page 163
ending page 171
digital object identifier (doi) 10.1107/S0021889810050399
web of science category Chemistry, Multidisciplinary; Crystallography
subject category Chemistry; Crystallography
unique article identifier WOS:000286475300020
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