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

[William Boyer]

H Neng,

You will encounter large systematic errors due to microabsorption when you have phases with very different μ, which is the case for Ni (μ=439 cm-1) and Co (μ=3150 cm-1) for Cu Kα radiation.  Use a Co or Mo anode.
μ (cm-1)
Cu anode
Co anode
Mo anode
Co
3150
587
370
Ni
439
668
422

c.f. “microabsorption” and
https://urldefense.us/v3/__https://www.researchgate.net/publication/337448242_Beware_if_you_are_Using_Cobalt_Effect_of_Fluorescence_and_Microabsorption_on_XRD_Patterns__;!!G_uCfscf7eWS!YPLIIeA6T8lVbFbQem04D8UQhCJoi59PXS65f6qsGz9ye6I2_yRVxPaSyrglWikSqWAIHSKYKfLpIJIWiy0$ 

best regards,
William Boyer
<><   ><>
Proto Manufacturing Inc - wboyer at protoxrd.com<mailto:wboyer at protoxrd.com> - Materials Scientist

From: GSAS-II <gsas-ii-bounces at aps.anl.gov> On Behalf Of Neng Huang via GSAS-II
Sent: Wednesday, December 4, 2024 3:22 PM
To: 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
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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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