Figure 5.
Magnitude and imaginary part of the k3-weighted Fourier transform of (a) Ni K-edge EXAFS spectrum and fit of reduced Ni4Fe1 (Fourier transform was taken over k = 3.3 to 11, and the fitting was done from R = 1 to 3.5. The amplitude reduction factor was calculated to be 0.79 from fitting the EXAFS spectrum for the Ni foil) and (b) Fe K-edge EXAFS spectrum and fit of reduced Ni4Fe1 (Fourier transform was taken over k = 3 to 12, and the fitting was done from R = 1 to 2.9. The amplitude reduction factor was calculated to be 0.7 from fitting the EXAFS spectrum for the Fe foil).