I have XAFS measurements, performed at SSRL at room temperature, of three compounds. All compounds have multielemental character and I have K-edge XAFS of two elements in each compound. It is desirable to make IFEFFIT fitting of both edges simultaneously. In all cases random solution of competing elements is assumed, but there are ferroelectricity, superconductivity or magnetic behaviors that are desirable to be explained. In each case, XAFS would confirm or reject the random character of the solution. I am not such an expert for resolving by myself how to fit together two edges using Artemis software. I'll present each case in the following:
1. rutheno-cuprate (Ru1-xNbx)Sr2Eu1.4 Ce0.6Cu2O10+δ compounds series was studied in both Ru and Nb K-edges. Changes in interatomic distances that could be obtained by EXAFS would tell something about oxygen octahedra around Ru and Nb.
2. g-Fe1-xCrxO3 maghemite for x=0.25, 0.5 and 0.75 was investigated by XAFS in both Fe and Cr K-edges. Possible distortion of oxygen octahedra around both Fe(III) and Cr(III) cations would tell something about not confirmed ferroelectricity.
3. LaFeNiTiO3 has been confirmed to display magnetic behavior and was studied by its Fe and Ti K-edges. Interatomic distances that could be obtained by EXAFS are interesting for checking possible preferential occupation of sites by Fe or Ti atoms.
Would any of you, please, suggest how to use Artemis or Sixpack for solving these problems?
Sincerely yours