Cementite EXAFS - thanks - Ifeffit - millenia.cars.aps.anl.gov

Cementite EXAFS - thanks

Bhoopesh Mishra

24 Sep 2009 24 Sep '09

4:08 p.m.

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 http://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

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Matt Newville

24 Sep 24 Sep

4:35 p.m.

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.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

Bhoopesh Mishra

4:49 p.m.

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 wrote:

...

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.html http://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

Scott Calvin

5:08 p.m.

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

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Bhoopesh Mishra
Matt Newville
Scott Calvin