[Ifeffit] [Ext] Re: structure for reference Mn foil

[Hu, Yang (HIU)]

Dear Carlo,

Thank you for the suggestions! Then I will focus on the Mn oxides we measured 
together.

Best regards,
Yang

-----Original Message-----
From: Carlo Segre [mailto:segre at iit.edu]
Sent: Monday, May 16, 2022 12:14 AM
To: XAFS Analysis using Ifeffit <ifeffit at millenia.cars.aps.anl.gov>
Subject: Re: [Ifeffit] [Ext] Re: structure for reference Mn foil

Hi Yang,

The Mn standard reference "foil" is not good for S02 calculation.  You are 
better off using a Mn sample that has the same kind of local environment as 
your unknown materials.  If you have oxides, then get a good Mn-oxide 
reference material and use that.

Carlo

On Sat, May 14, 2022 at 6:34 AM Matt Newville <newville at cars.uchicago.edu 
<mailto:newville at cars.uchicago.edu> > wrote:


	Hi Yang,


	On Thu, May 12, 2022 at 1:29 PM Hu, Yang (HIU) <yang.hu at kit.edu 
<mailto:yang.hu at kit.edu> > wrote:


		Dear IFEFFIT members,



		I have been trying to obtain the S02 value from metal reference foils 
measured at the beamline.


	How was your sample Mn metal prepared?   Do you have verification that it is 
metallic?

	When you say "from metal reference foils measured at the beamline.", I 
wonder if that might be the same kind of


	"reference foil set" in the wooden jewelry box that we have at our beamline. 
Most of these are very good, while some (Pb) degrade over time.  Ours has one 
labeled "Mn" which is obviously a black powder, probably sintered.  I've never 
tried to analyze that as BCC Mn and assumed it was stable-ish, but not 
metallic.   But maybe someone else has tried that.

	--Matt
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-- 

Carlo U. Segre (he/him) -- Duchossois Leadership Professor of Physics 
Professor of Materials Science & Engineering Director, Center for Synchrotron 
Radiation Research and Instrumentation Illinois Institute of Technology
Voice: 312.567.3498            Fax: 312.567.3494
segre at iit.edu <mailto:segre at iit.edu>    http://phys.iit.edu/~segre 
segre at debian.org <mailto:segre at debian.org>

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