Mesoscopic structure features in synthetic graphite

The mesocopic structure features in the coke fillers and binding carbon regions of a synthetic graphite grade have been examined by high resolution transmission electron microscopy (TEM) and Raman spectroscopy. Within the fillers, the three-dimensional structure is composed of crystal laminae with t...

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Main Authors: März, B, Jolley, K, Marrow, T, Zhou, Z, Heggie, M, Smith, R, Wu, H
Format: Journal article
Izdano: Elsevier 2018
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author März, B
Jolley, K
Marrow, T
Zhou, Z
Heggie, M
Smith, R
Wu, H
author_facet März, B
Jolley, K
Marrow, T
Zhou, Z
Heggie, M
Smith, R
Wu, H
author_sort März, B
collection OXFORD
description The mesocopic structure features in the coke fillers and binding carbon regions of a synthetic graphite grade have been examined by high resolution transmission electron microscopy (TEM) and Raman spectroscopy. Within the fillers, the three-dimensional structure is composed of crystal laminae with the basal plane dimensions (La) of hundreds nanometres, and thicknesses (Lc) of tens of nanometres. These laminae have a nearly perfect graphite structure with almost parallel c-axes, but their a–b planes are orientated randomly to form a “crazy paving” structure. A similar structure exists in the binding carbon regions, with a smaller La. Significantly bent laminae are widely seen in quinoline insoluble inclusions and the graphite regions developed around them. The La values measured by TEM are consistent with estimates from the intensity ratios of the D to G Raman peak in these regions. Atomistic modelling finds that the lowest energy interfaces in the crazy paving structure comprise 5, 6 and 7 member carbon rings. The bent laminae tend to maintain the 6 member rings, but are strained elastically. We suggest that a 7 member carbon ring leaves a cavity representing an arm-chair graphite edge contributing to the Raman spectra D peak.
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spelling oxford-uuid:b8ed5778-bfc6-4cb6-8e3d-dbf4241388e32022-03-27T04:59:29ZMesoscopic structure features in synthetic graphiteJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b8ed5778-bfc6-4cb6-8e3d-dbf4241388e3Symplectic Elements at OxfordElsevier2018März, BJolley, KMarrow, TZhou, ZHeggie, MSmith, RWu, HThe mesocopic structure features in the coke fillers and binding carbon regions of a synthetic graphite grade have been examined by high resolution transmission electron microscopy (TEM) and Raman spectroscopy. Within the fillers, the three-dimensional structure is composed of crystal laminae with the basal plane dimensions (La) of hundreds nanometres, and thicknesses (Lc) of tens of nanometres. These laminae have a nearly perfect graphite structure with almost parallel c-axes, but their a–b planes are orientated randomly to form a “crazy paving” structure. A similar structure exists in the binding carbon regions, with a smaller La. Significantly bent laminae are widely seen in quinoline insoluble inclusions and the graphite regions developed around them. The La values measured by TEM are consistent with estimates from the intensity ratios of the D to G Raman peak in these regions. Atomistic modelling finds that the lowest energy interfaces in the crazy paving structure comprise 5, 6 and 7 member carbon rings. The bent laminae tend to maintain the 6 member rings, but are strained elastically. We suggest that a 7 member carbon ring leaves a cavity representing an arm-chair graphite edge contributing to the Raman spectra D peak.
spellingShingle März, B
Jolley, K
Marrow, T
Zhou, Z
Heggie, M
Smith, R
Wu, H
Mesoscopic structure features in synthetic graphite
title Mesoscopic structure features in synthetic graphite
title_full Mesoscopic structure features in synthetic graphite
title_fullStr Mesoscopic structure features in synthetic graphite
title_full_unstemmed Mesoscopic structure features in synthetic graphite
title_short Mesoscopic structure features in synthetic graphite
title_sort mesoscopic structure features in synthetic graphite
work_keys_str_mv AT marzb mesoscopicstructurefeaturesinsyntheticgraphite
AT jolleyk mesoscopicstructurefeaturesinsyntheticgraphite
AT marrowt mesoscopicstructurefeaturesinsyntheticgraphite
AT zhouz mesoscopicstructurefeaturesinsyntheticgraphite
AT heggiem mesoscopicstructurefeaturesinsyntheticgraphite
AT smithr mesoscopicstructurefeaturesinsyntheticgraphite
AT wuh mesoscopicstructurefeaturesinsyntheticgraphite