[Ifeffit] EXAFS of solid-solution alloy
Chongchong Mellon
mellonchongchong at gmail.com
Fri Feb 8 04:36:24 CST 2019
Hi all,
I have some problems in analyzing the EXAFS of solid-solution alloy, let
us define as A0.5B0.5. I have searched the mailbox but cannot find similar
discussion yet. So I post the question here and hope to get some suggestion
from you.
1. A and B are immiscible metals from the phase diagram, which means
that I couldn’t get the bulk A0.5B0.5 as a standard reference. In this
case, how can I estimate the amp for the K-edge of A or B?
2. A and B are very near (atomic number B-A = 2) in the periodic table.
So their lattice parameters are quite close to each other. In this case,
when I tried to fit the 1st shell use A-A and A-B paths at the same time,
the Happiness parameter becomes worse and the coordination number of A-B is
not realistic (large errors!). If I fit with only the A-A path or A-B
path, I get a good fit. However, atomic resolution STEM-EDX maps show the
homogenous distribution of both A and B atoms. The A-A and A-B bond might
have an equal ratio. In this case, how can I do the fitting?
Thank you very much in advance!
Sincerely,
Chong
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