Abstract
Two experimental methods (δ synthesis and ‘bichromatic’ least squares refinement) to distinguish the site occupancy of elements with similar atomic number in crystal structures are described and applied to sulfosalt structures. Both methods are based on anomalous dispersion effects near absorption edges and use synchrotron radiation because of specific wavelength requirements. Results on the Pb/Bi distribution in the sulfosalts galenobismutite (PbBi2S4), cosalite (Pb2Bi2S5) and eclarite [(Cu, Fe)Pb9Bi12S28] are presented and compared with former site assignments determined with geometrical methods.
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