Hello,
I am a bit confused about the amplitude reduction factor (S0^2), in a sense
that whether this factor must be determined by fitting or constrained by a
reference value for a specific element. I'm dealing with a cathode composite
(for lithium-ion battery) comprised of two crystal
Hi Hoon,
Using a reference value is not always a good idea, because experimental effects
can play a role.
BUT, S02 should not change during charge-discharge on a single sample, or a
series of samples prepared and measured similarly. Instead, it's likely
something correlated with S02 in the
Dear Scott,
Thank you for your advice.
Q) I assume that your second solution allow different S02 values for each
spectrum?
I'd like to be more specific about my obtained results,
At reference state (that means without any applied current), the amplitude
reduction factor was 0.77At 20% charge,
On Sep 18, 2014, at 8:20 AM, HOON Kim
scie...@live.co.krmailto:scie...@live.co.kr wrote:
Dear Scott,
Thank you for your advice.
Q) I assume that your second solution allow different S02 values for each
spectrum?
No. My second solution is to fit one of them, say the reference at 0.77, and
On 09/18/2014 07:23 AM, Scott Calvin wrote:
Hi Hoon,
Using a reference value is not always a good idea, because experimental
effects can play a role.
I want to elaborate a bit on this point in Scott's post, particularly
given the nature of your sample.
The materials in a battery, as they
By the way, you should also look closely at how well the edge jump is being
determined by Athena (or whatever software you use for the data reduction). If
there's a white line or pre-edge feature that's changing, it's possible the
default behavior of Athena is not determining the edge jump in a
On 09/18/2014 08:20 AM, HOON Kim wrote:
I'd like to be more specific about my obtained results,
At reference state (that means without any applied current), the
amplitude reduction factor was 0.77
At 20% charge, it was 0.67
40% charge = 0.66
60% charge = 0.63
80% charge = 0.68
full charge =
Dear Scott,
Thank you for your advice.
As a transmission XAS experiment, I don't think there was a white line. But,
the pre-edge feature (in XANES) tends to change according to the charge state
of the battery. (I believe this is a general observation in terms of the
cathode material)
Kind
Dear Bruce,
Good point ! I will keep it in mind. (error bars were like +/- 0.05677..)
Kind Regards,HOON
Date: Thu, 18 Sep 2014 09:11:03 -0400
From: bra...@bnl.gov
To: ifeffit@millenia.cars.aps.anl.gov
Subject: Re: [Ifeffit] Inconsistency of the amplitude reduction factor
On 09/18/2014 08:20
