DC pole | Wartość | Język |
dc.contributor.author | Duber, Stanisław | - |
dc.date.accessioned | 2018-05-24T07:34:01Z | - |
dc.date.available | 2018-05-24T07:34:01Z | - |
dc.date.issued | 2011 | - |
dc.identifier.isbn | 9788322620380 | - |
dc.identifier.isbn | 9788380126503 | - |
dc.identifier.uri | http://hdl.handle.net/20.500.12128/3937 | - |
dc.description.abstract | Anthracites originated in Europe, Asia, Africa and North America were investigated
in the presented work. Anthracites cover a whole range of metamorphism from
semi-anthracites to meta-anthracites, that is the last stage of metamorphism before
transformation from carbon matter to semi-graphites. Nanostructure and microtexture
research concentrated on finding common characteristics for that group of metamorphosed
carbon matter, apart from the local geological conditions of metamorphism for
particular anthracites.
Anthracite nanostructure was investigated by means of high-resolution transmission
electron microscopy (HR TEM), X-ray diffraction and Raman spectroscopy. Three basic
structure elements were distinguished in investigated anthracites:
a) individual, single, isolated layers (not always flat) of condensed aromatic rings,
b) layers arranged in stacks/packets (on average between 3 and 7 layers),
c) atoms of “amorphous carbon”.
Three structure elements coexisted in all anthracites. The amount of atoms of “amorphous
carbon” decreased, whereas an average number of layers in stacks increased from
3 to 7 with the increase of metamorphism, as well as the diameter of the layers changed
from 1.8 nm for semi-anthracites to 4.8 nm for meta-anthracites.
Anthracite microtexture was investigated by means of transmission electron
microscopy (dark field DF TEM) and measurement of reflection coefficient for polarized
light. In the whole group of anthracites four types of microtextures were distinguished:
A) grains or areas without any texture, i.e. with a lack of the arrangement of the layers
and stacks,
B) areas where statistically distinguished direction of the orientation of layers and
stacks is present,
C) areas where statistically distinguished plane of the orientation of layers and stacks is
present (defected lamellas),
D) grains with perfect arrangement of the layers and stacks in respect to the distinguished
plane (perfect lamellas).
In semi-anthracites (A) and (B) types of microtexture dominated and very seldom
grains with (C) type microtexture were found. In meta-anthracites (B) and (C) types of
microtexture predominated with increasing participation of (D) type microtexture. Volume,
penetration of different nanostructures and microtextures and a lack of distinct boundaries between them are changing depending not only on the investigated anthracite,
but also within any particular anthracite. The research proved that nanostructure
and microstructure heterogeneity is an inherent feature to all investigated anthracites.
That feature is not connected with the degree of metamorphism of the investigated substance. | pl_PL |
dc.language.iso | pl | pl_PL |
dc.publisher | Wydawnictwo Uniwersytetu Śląskiego | pl_PL |
dc.rights | Uznanie autorstwa-Użycie niekomercyjne-Bez utworów zależnych 3.0 Polska | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/pl/ | * |
dc.subject | antracyt struktura | pl_PL |
dc.subject | antracyt tekstura | pl_PL |
dc.title | Nanostruktura i mikrotekstura antracytów | pl_PL |
dc.type | info:eu-repo/semantics/book | pl_PL |
Pojawia się w kolekcji: | Książki/rozdziały (WNP)
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