Hi all,
@Drew Latta: I was wondering why the end members should be magnetite and
maghemite. Is it because they are both of inverse-spinel structure, the
difference only being that the latter has all Fe completely oxidized into
Fe(III)? Would you be able to provide the standard spectra to me if that is
the case? Thanks very much!
Previously I have only thought of using hematite (alpha-Fe2O3) and FeO as
end-members, both representing Fe(III) and Fe(II) respectively without
giving much thought to the structure Fe takes. I also had my doubts using
magnetite (Fe3O4) as a standard as it is a mixture of both Fe (II) and Fe
(III). But thanks to the insights Drew has given, I now think I should take
the Fe-coordination environment into account with the use of magnetite and
maghemite as standards.
@Alexandre and Matthew: I have obtained Mossbauer spectra of some of my
samples but like Drew said, it is not straightforward at this point in
time. Will see what I can do with the data I have!
Thanks for all your responses! It is greatly appreciated! This forum has
been more helpful than I thought!
Teck Kwang
On 13 August 2013 01:34, Matthew Marcus
While it's true that Mossbauer is the gold standard for Fe valence determination, access to the technique isn't all that common, and I don't know of any facility that can do it on a micro scale. Is there one? mam
On 8/12/2013 7:01 AM, Alexandre dos Santos Anastacio wrote:
Hello,
maybe that fingerprinting technique would be Mossbauer spectroscopy. The Fe(II)/Fe(III) ratio comes easily and also there are lots of papers about Mg-ferrite, an example:
10.1109/TMAG.2009.2018880 <http://dx.doi.org/10.1109/**TMAG.2009.2018880http://dx.doi.org/10.1109/TMAG.2009.2018880
Alexandre.
______________________________**_________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.**gov
http://millenia.cars.aps.anl.**gov/mailman/listinfo/ifeffithttp://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/ifeffithttp://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
-- Teck Kwang Choo PhD Student Department of Chemical Engineering Room 225, Building 36 Monash University Mobile No.: 04-11489904