I have a sample which is a mixture of PtFe and PtO2. In order to do the EXAFS fitting, I imported 2 CIF files on Artemis and generated the following 3 paths:

From PtO2: Pt-O @ 2.07 nm

From Pt3Fe: Pt-Pt @ 2.736 nm, Pt-Fe @ 2.736 nm

Then, I used these 3 bonds to do the fitting as in the online tutorial (which used 1 CIF file). The fitting result is good in terms of R^2 but it is not scientifically correct.

I think I didn't set up a parameter which determines the ratio between CIF(PtO2) and CIF(Pt3Fe). I mean there should be a parameter that regulates how much each CIF contributes to the fitting or the molar ratio between PtO2 and Pt3Fe in my system.

Could someone please give me some suggestions on how to do EXAFS fitting with 2 CIF files? Is there anywhere I can set up the molar ratio between PtO2 and Pt3Fe?

Yours sincerely,

Zihao Yan