chemical physics of discharges - Argonne National Laboratory

CONCLUSION
429
In sumnary, several coal sanples contain a form of iron which exhibits a
hitherto unobserved M'dssbauer spectrum, in addition to the well-known pyrite
spectm. Tne non-pyrite iron is ferrous, in a high-spin configuration, in
cctahedral s;metry, and apparently in a rather well-defined state Comparisons
with known compounds suggest that this iron my be bound in the cdl macerals to
heterocyclic nitrocen aromatic groups, though a clay-like silicate mineral or gel
is a possibility. iicssbauer spectrometry can at the very least indicate the
most suitable coal samples for further studies of this iron by chemical and other
metbds.
coal with synthetic ccapounds or analogs. We intend to pursue this line Of
inrestiGtion.
ACKNOWLEKmNTS
It should ultimately permit unamoimous identification of the iron in
'vle wish to ttank Drs. Maurice Deul and Bryan C. Parks of the Bureau of Mines
for their assistance in obtaining some of the coal samples. We are especifrllly
indebted to Mr. Michael Toia for the construction and msintenance of the Mossbauer
spectrometer.
The work at Carnegie,Institute of Technology was performed under
the auspices of tke U.S. Atomic Energy Commission under contract AT(30-1)-844;
Report No. NYO-&44-63.