[Ifeffit] Linear Combination Fitting using ATHENA

[María Elena Montero Cabrera]

Hi all!
I am out of my place and I can not check it now, but I believe that in the
database of XAFS (or something like that) there are some spectra of
maghemites obtained  by Lytle long time ago.
Best regards
Maria Elena Montero Cabrera
El ago 13, 2013 3:38 a.m., "Teck Kwang Choo" <teck.kwang.choo at monash.edu>
escribió:

> 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 <mamarcus at lbl.gov> wrote:
>
>> 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.2009.2018880<http://dx.doi.org/10.1109/TMAG.2009.2018880>
>>> >
>>>
>>> Alexandre.
>>>
>>>
>>>
>>>
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>
>
>
> --
> Teck Kwang Choo
> PhD Student
> Department of Chemical Engineering
> Room 225, Building 36
> Monash University
> Mobile No.: 04-11489904
>
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