[Ifeffit] Correct Crystallographic parameters for Todorokite EXAFS fit

[Sathish Mayanna]

Dear Dr. Robert

Thanks a lot for your information that's very helpful.

I checked the ICSD, but unfortunately we don't have access to the crystal
data. It would be great, if you or someone has the access to the crystal
data to provide me the coordinates, the *collection code: 202727, Author:
Post, Year: 1988. *

*Please let me know, if someone has the access to the data.*

Regards
Sathish




On Thu, Feb 6, 2014 at 11:05 PM,
<ifeffit-request at millenia.cars.aps.anl.gov>wrote:

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>    1. Re: Correct Crystallographic parameters for Todorokite EXAFS
>       fitting in Artemis (Robert Gordon)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 06 Feb 2014 16:05:30 -0600
> From: Robert Gordon <ragordon at alumni.sfu.ca>
> To: XAFS Analysis using Ifeffit <ifeffit at millenia.cars.aps.anl.gov>
> Subject: Re: [Ifeffit] Correct Crystallographic parameters for
>         Todorokite EXAFS fitting in Artemis
> Message-ID: <52F4072A.1070008 at alumni.sfu.ca>
> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
>
> Hi Satty,
>
> The crystal data in your inp file came from the paper. I checked the
> International
> Crystal Structure Database (ICSD) - printout attached. The structure
> data in the paper
> are not in standard form - atoms might not give the correct results if
> the input is bad- and there
> are typos for two of the O5 coordinates according to the ICSD warning.
> Does your institution have access to the ICSD - Online or on disc? If you
> are not familiar with it, try talking to one of your institution's
> reference librarians.
>
> I'm not certain what you mean by the corner-corner Mn. You were choosing
> Mn1
> as the core in your inp. When I look at the structure, Mn1 sits in the
> middle of
> the set of 3 octahedra that make up a side of the tunnel. Where would
> the corner-corner
> distance be relative to the middle of the chain? You have 4 different Mn
> sites.
>
> Fitting in R-space is common.
>
> As for learning about crystal structures, try sitting in on a
> coordination chemistry
> or solid state chemistry course. For a basic learning book, I like
> West's "Basic Solid
> State Chemistry" or Muller's "Inorganic Structural Chemistry" (again,
> try the library
>   if you don't want to buy a copy). More recent books may be available.
> A bit of
> googling may reveal some online lessons, like:
> http://www.seas.upenn.edu/~chem101/sschem/solidstatechem.html
>
>
> regards,
> Robert
>
>
> On 2/6/2014 3:16 AM, Sathish Mayanna wrote:
> > Hi
> >
> > I am having some problem to get the real crystallographic parameters
> > for Todorokite (I know there are many literature available) I used the
> > parameters from Post et al 1988 (/Rietveld refinement of the
> > Todorokite structure/) and others as well (*attached Todorokite.inp
> > file*).
> >
> > I except the corner corner Mn in Todorokite, since its a tunnel
> > structure, but the Feff calculations do not provide any corner corner
> > Mn, in addition I cannot fit exactly even Mn-O or Mn-Mn.
> >
> > But If I use Ramsdellite (*attached Ramsdellite.inp file*), which is
> > also a tunnel structure, I could get the Corner-Corner Mn and can fit
> > perfectly the Mn-O, Mn-Mn, but cannot fit in K space.
> >
> > It would be really great, if anyone could provide me the model Tunnel
> > type-Mn oxide crystallographic parameters to fit the data *(attached
> > Mn Spectra.prj)*
> >
> > p.s: I tried my best to learn and understand the crystallographic
> > parameters and miller indices, but still I feel that I am very poor,
> > it would be nice, if someone suggest some good and basic source to
> > learn more about pure mineralogy (which is crucial to know the basic
> > parameters for fitting in Artemis).
> > --
> > Satty
> >
> >
> > _______________________________________________
> > Ifeffit mailing list
> > Ifeffit at millenia.cars.aps.anl.gov
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>
> --
> Dr. Robert Gordon
> Staff Scientist, PNCSRF
> APS Sector 20 (PNC/XSD)
> 9700 S Cass Ave. 435E
> Argonne, IL, USA  60439
>
> 630-252-0581
> 630-252-0580 fax
>
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-- 
Satty
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