Bhoopesh,
I would trust the XAFS.org spectrum more than mine, I'm sure that the APS
has a better resolution etc. I'm aware that there are other forms of reduced
iron carbide, but I did nothing special except for following the Li et al.
paper. I then tried to see if the spectrum was similar to both
One thing I can say is that the EXAFS data in Matt's archive is
reasonably well fit by a cementite structure. Since there's a lot of
variation in cementite-like materials, that doesn't tell us exactly
what it is, but at least it's in the right family.
--Scott Calvin
Sarah Lawrence College
O
Hi Matt,
I imagined you might not remember about the data or how was it
prepared, so I decided not to bother you asking about it. But sounds like
you do have an amazing memory.
Yes, I would be happy to characterize the sample by running both EXAFS
and XRD on it if you still have it. I
Hi Bhoopesh,
It's amazing to me how many people have asked about this data set.
I did not prepare the sample of Fe3C measured for the data in the
model compound library. Basically, a user interested in reduced iron
phases and with good knowledge of carbides showed up at the beamline
with a vial
Hi Scott and Mathew,
Thanks for pointing me to Matt Newville's archive. It is a great
resource to have and I have used it on several occasions.
However, what I found on that database is "Fe3C". Since there are
couple of different local environments for Fe3C, and not all of them are
Ceme
I have a spectrum (up to 300eV above the edge) for haxonite, another Fe
carbide, which is found in meteorites. The sample was a
meteorite section provided by
Excalibur Minerals. If you have any of the Fe3C sample left over, I'd love to
have it to measure myself.
mam
- Original Message
Hi Andrew,
Thank you so much for your reply. I could run a sample myself but
that can not happen in next few weeks (until my next beamtime). I would be
very thankful to you if you could send me your spectrum. I need to use it as
a standard.
Thanks,
Bhoopesh
On Thu, Sep 24, 2009 at 12:42 P
Bhoopesh,
There's a paper which says how to make it if you want to run it on your own:
"Fe3C, which can form during FTS reactions, was prepared by
temperature-programmed reaction (0.167 K/s) of
Fe2O3 up to 973 K using CO (Matheson, 99.99%, 107 mol of CO/mol of Fe h) as
the reduction and carburiz
Hi Bhoopesh,
There are files that are identified as cementite in Matt Newville's
archive:
http://cars9.uchicago.edu/~newville/ModelLib/search.html
If you manage to get any other data, let me know; I've used the
standard at the link above, but I'd like to confirm it.
--Scott Calvin
Sarah Law
Dear All,
I am writing to see if anyone on this mailing list has ever
measured "Cementite" (Fe3C) EXAFS. It is basically an Iron Carbide, nothing
exotic at all.
I would be very grateful to anyone who might want to share an EXAFS
spectrum of Cementite (Fe3C).
Regards,
Bhoopesh
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