[GSAS-II] Quantification of Nickel and Cobalt alloy by refinement in GSAS-II

[Toby, Brian H.]

Hi Neng,

  You don’t say what type of data you are using, but Ni and Co differ in scattering power by only 1 electron, if using x-rays. One needs a very precise intensity measurement to see that small a change, but since one also needs to determine the Uiso values, it becomes nearly impossible without data collected over a very wide Q range. This is not an experiment that can be done with a lab source IMO and is only going to give very approximate values with a high resolution synchrotron measurement. Neutrons will provide the contrast you need.

Brian

From: GSAS-II <gsas-ii-bounces at aps.anl.gov> on behalf of Neng Huang via GSAS-II <gsas-ii at aps.anl.gov>
Date: Wednesday, December 4, 2024 at 2:22 PM
To: gsas-ii at aps.anl.gov <gsas-ii at aps.anl.gov>
Subject: [GSAS-II] Quantification of Nickel and Cobalt alloy by refinement in GSAS-II
Hello,

I am encountering an issue with quantifying Nickel and Cobalt by weight percentage in GSAS-II for my powder X-ray data from a reduced battery sample. Since the two phases are quite close, the Wt. fractions of the two phases in GSAS seem to be not reasonable, could you please advise on how to adjust the steps in GSAS-II to accurately determine the phase concentration in the Ni-Co alloy mixtures by refinement?

Thank you.

Best regards,
Neng Huang
University of Kentucky
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