[Ifeffit] Cementite EXAFS

Matthew mamarcus at lbl.gov
Thu Sep 24 14:50:50 CDT 2009

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.
----- Original Message ----- 
From: "Andrew" <acampo2 at tigers.lsu.edu>
To: <ifeffit at millenia.cars.aps.anl.gov>
Sent: Thursday, September 24, 2009 10:42 AM
Subject: [Ifeffit] Cementite EXAFS

> 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 carburization agent.
> The resulting Fe3C powder was passivated in flowing 1% O2/ He (Matheson,
> 99.999%, 0.05 mol/h) at room temperature (RT) for 1 h before removing the
> sample from the synthesis cell." [1] S. Li, G.D. Meitzner and E. Iglesia,
> J. Phys. Chem. B, 105 (2001) 5743.
> I made some myself using this method. I would send my spectrum, but if I can
> recall we had glitches in the EXAFS region.
> Andrew Campos
> ** If you want other iron carbides, this will be quite tricky since this is
> the only one that can be synthesized to a pure extent... obviously one could
> make cementite to using an iron melt but that requires really high
> temperature furnaces etc.
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