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
Cementite - I am not sure if that would be a good standard for me.
Nevertheless, it served as a good starting point.
It would be great if Andrew can send us his data.
Thanks again,
Bhoopesh
On Thu, Sep 24, 2009 at 11:54 AM, Scott Calvin
Hi Bhoopesh,
There are files that are identified as cementite in Matt Newville's archive:
http://cars9.uchicago.edu/~newville/ModelLib/search.htmlhttp://cars9.uchicago.edu/%7Enewville/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 Lawrence College
On Sep 24, 2009, at 11:45 AM, bhoopeshm wrote:
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
Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
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 of black powder marked Fe3C. We made a powder-on-tape
sample of this and measured it. At the time, the user (who knows
about diamond synthesis and who I trust) said the sample was made by
another colleague. Yes, it all sounds "secret formula", and I do not
know whether it is pure cementite. If you're interested, believe I
still have this sample in my Standards Notebook if you'd like to
measure XAFS or XRD on it.
--Matt
On Thu, Sep 24, 2009 at 4:08 PM, Bhoopesh Mishra
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 Cementite - I am not sure if that would be a good standard for me. Nevertheless, it served as a good starting point.
It would be great if Andrew can send us his data.
Thanks again, Bhoopesh
On Thu, Sep 24, 2009 at 11:54 AM, Scott Calvin
wrote: 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 Lawrence College
On Sep 24, 2009, at 11:45 AM, bhoopeshm wrote:
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
Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
_______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
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 would of course share the information
with the mailing list, once I characterize it. I will collect the sample
from you sometime soon. Thanks again for offering.
Regards,
Bhoopesh
On Thu, Sep 24, 2009 at 4:35 PM, Matt Newville
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 of black powder marked Fe3C. We made a powder-on-tape sample of this and measured it. At the time, the user (who knows about diamond synthesis and who I trust) said the sample was made by another colleague. Yes, it all sounds "secret formula", and I do not know whether it is pure cementite. If you're interested, believe I still have this sample in my Standards Notebook if you'd like to measure XAFS or XRD on it.
--Matt
On Thu, Sep 24, 2009 at 4:08 PM, Bhoopesh Mishra
wrote: 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 Cementite - I am not sure if that would be a good standard for me. Nevertheless, it served as a good starting point.
It would be great if Andrew can send us his data.
Thanks again, Bhoopesh
On Thu, Sep 24, 2009 at 11:54 AM, Scott Calvin
wrote: Hi Bhoopesh,
There are files that are identified as cementite in Matt Newville's archive:
http://cars9.uchicago.edu/~newville/ModelLib/search.htmlhttp://cars9.uchicago.edu/%7Enewville/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 Lawrence College
On Sep 24, 2009, at 11:45 AM, bhoopeshm wrote:
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
Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
_______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
_______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
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 On Sep 24, 2009, at 5:49 PM, Bhoopesh Mishra wrote:
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 would of course share the information with the mailing list, once I characterize it. I will collect the sample from you sometime soon. Thanks again for offering.
Regards, Bhoopesh
participants (3)
-
Bhoopesh Mishra
-
Matt Newville
-
Scott Calvin