Electron Microscopy of Graphitic Crystallites in Meta-Anthracite

McCartney, J.T.; Ergun, S.

doi:10.1038/205962a0

Cited by 16 publications

(7 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, it is worth mentioning the appearance of the 11(2) peak in the sample profiles prepared at temperatures higher than 2100 • C. The presence of the 11(2) reflections is usually considered as evidence for the tridimensional crystalline order. 32,33 Figure 5(a) presents the plots of the height intensity ratio I D /I G , obtained from the fitting procedure, vs the inverse values of the "crystallite" diameter collected from 14 unpolished samples and characterized by varying precursors and disorder degrees. A linear behavior is thus observed between the band height ratios (obtained from the fitting procedure) and the "crystallite" diameter.…”

Section: Dependence Of Crystallite Diameter On the Intensity Ratio An...mentioning

confidence: 99%

Determination of crystallite size in polished graphitized carbon by Raman spectroscopy

et al. 2012

View full text Add to dashboard Cite

show abstract

Section: Dependence Of Crystallite Diameter On the Intensity Ratio An...mentioning

confidence: 99%

Determination of crystallite size in polished graphitized carbon by Raman spectroscopy

et al. 2012

View full text Add to dashboard Cite

show abstract

“…At this stage the irreversible transition from amorphous carbon to crystalline carbon starts; first true graphite crystals become observable in X-ray and REM analyses (e.g. McCartney and Ergun 1965). To cause high conductivity in a rock, in- terconnectivity of the carbonaceous/graphitic matter is also an essential prerequisite.…”

Section: Black Shales and The Interpretation Of Deep Conductorsmentioning

confidence: 99%

The distribution of Pre-Westphalian source rocks in the North German Basin – Evidence from magnetotelluric and geochemical data

Hoffmann

Jödicke

Gerling

2001

Netherlands Journal of Geosciences

View full text Add to dashboard Cite

For the first time this project attempts to directly correlate magnetotelluric and geochemical data with the aim of creating a model on the regional distribution of potential pre-Westphalian source rocks deposited in marine environments in the North German basin.Analysis of the magnetotelluric data shows, that there is a deep good conductor at the north-eastern fringe of the North German basin around the islands of Rügen and Usedom and on the mainland north east of the Anklam Fault. Through integration with seismic data and the offshore well G14 the conductor can be correlated with the Cambro-Ordovician Scandinavian Alum shales. To the south an adjoining area approximately corresponding to the depo-centre of the Rotliegend basin lacks a deep good conductor. Therefore it can be assumed that a regional distribution of comparable source rocks is unlikely. Another excellent and important conductor starts to the south west of the Lower Elbe Line extending along the Dutch-German border into the North Sea, and into the Münsterland. Its place in the local stratigraphy has not been adequately established. It is most likely that this good conductor corresponds to the black shales of the Early Namurian and the Dinantian, which is the case in the boreholes Münsterland 1 and Pröttlin 1 for example. In this paper they are collectively called Rhenohercynian Alum shales. On the Dutch-German border a transition into the “Bowland Shale” facies or equivalents is to be expected. It cannot be ruled out that even stratigraphically older black shales, possibly from the Cambro-Ordovician could contribute to the high integrated conductivity of the deep good conductor.The evidence of highly conductive layers in the deep subsurface poses the question whether these layers could be potential source rocks for the gases in the north German gas fields. This question can be answered with a clear yes. Gas and isotope geochemical studies on gases from producing Rotliegend deposits have shown that Rhenohercynian Alum shales have been a significant source for these fields. This will be illustrated in detail using the gas fields from the production province “Ems Estuary” as an example.

show abstract

“…This has led to renewed interest in understanding the structure at a fundamental level. Over the years, several studies − have been done to gain insight into the coal structure using different techniques such as X-ray diffraction (XRD), optical microscopy (OM), and nuclear magnetic resonance (NMR). All these studies converge on one understanding; coal is heterogeneous in nature and made up of very small aromatic layers more-or-less randomly orientated.…”

Section: Introductionmentioning

confidence: 99%

Direct Observation of Raw Coals in Lattice Fringe Mode Using High-Resolution Transmission Electron Microscopy

2000

View full text Add to dashboard Cite

High-resolution transmission electron microscopy (HRTEM) technique has been used to characterize several coals. By careful examination, direct evidence of layered structure in a wide range of coals was for the first time obtained from HRTEM lattice fringes. In general, most of the layers in all coals occur singly or in stacks of 4−5 layers. Quantitative analysis of coal images showed that average number of layers per stack and layer size remain almost the same for lignite and high volatile bituminous and medium volatile bituminous coals, and they are larger for low volatile bituminous coal and anthracite.

show abstract

Electron Microscopy of Graphitic Crystallites in Meta-Anthracite

Cited by 16 publications

References 3 publications

Determination of crystallite size in polished graphitized carbon by Raman spectroscopy

Determination of crystallite size in polished graphitized carbon by Raman spectroscopy

The distribution of Pre-Westphalian source rocks in the North German Basin – Evidence from magnetotelluric and geochemical data

Direct Observation of Raw Coals in Lattice Fringe Mode Using High-Resolution Transmission Electron Microscopy

Contact Info

Product

Resources

About