Figure 1
Energy dependency of the diffraction intensity and f′ versus chemical shift δE. (a) The crystal structure factors are normalized at λ = 1.7499 Å (E − E0 = −34.3 eV), where E0 is at a second inflection point of the absorption curve of FeO. The 222 (open squares) and 226 (open triangles) reflections are mainly affected by the Fe2+ and Fe3+ of the B sites, while the 224 (solid squares) and the 026 (solid circles) reflections are contributed to only by the Fe3+ of the A sites. (b) Experimental f′ values for Fe2+ (solid line; FeO) and Fe3+ (dashed line; Fe2O3) obtained by the Kramers–Kronig transform of the XANES spectra. |