SAIKIA , B K and BORUAH, R K and GOGOI , P K
(2007)
XRD and FT-IR investigations of sub-bituminous Assam coals.
Bulletin of Materials Science, 30 (4).
pp. 421-426.
Abstract
Two coal samples collected from Makum coal field,
Assam, India were studied by XRD and FT-IR techniques.
The X-ray diffractogram shows the existence of some
crystalline carbons in Assam coals as proven by the
appearance of peaks. The radial distribution functional
(RDF) method was applied for the determination of
structural aspects of the coals. The study indicates that
the coals are lignite in type and there is no evidence of
graphite-like structures. The maximum in the G(r) plots
of function of radial distribution of atoms (FRDA) relates
to different distances between carbon atoms of aliphatic
chains. The first significant maximum relates to the C-C
bond (type C-CH=CH-C), the second maximum relates
to the distance between carbon atoms of aliphatic chains
that are located across one carbon atom. The curve
intensity profiles obtained from FRDA show quite regular
molecular packets for this coal. The coals were found to
be lignite in nature. FT-IR study shows the presence of
aliphatic carbon, C=O and C-O stretching associated with
-OH and -NH stretching vibrations. Kaolinite and quartz
were also found to be major minerals in Assam coals by
FTIR spectroscopy. The difference in intensities of
carbonyl groups of the coal samples is likely to relate
with the rank. © Indian Academy of Sciences.
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