XPS measurement of fivefold and sixfold coordinated sulfur in pyrrhotites and evidence for millerite and pyrrhotite surface species

Collection of S 2p XPS spectra of millerite (NiS), using a conventional (Al K alpha) and a synchrotron photon source, demonstrates the presence of one surface species on millerite (NiS) and spectral deconvolution indicates a s econd surface contribution. The observed surface core-level shift (binding energy = 161.1 eV) is attributed to a surface monomeric species (S2-) where as the second contribution probably is a surface dimeric species (S-2(2-), binding energy = 162.3 eV). Surface dimers, if present, indicate surface re construction of millerite surfaces upon cleavage. Monoclinic (Fe7S8) and he xagonal (Fe10S11) pyrrhotite are non-stoichiometric due to vacancies on met al sites. The conventional S 2p XPS spectra of these phases, which sample p rimarily bulk sulfur stales, reveal contributions from fivefold and sixfold coordinated S atoms, the proportion of which is consistent with structural refinement studies. The more intense signal is derived from S in fivefold coordination (80-85%) and the remainder represents the sixfold contribution . Comparison of a highly surface sensitive S 2p XPS spectrum of pyrrhotite (photon energy tuned to 210 eV) with a conventional S 2p XPS signal (AlK al pha source) indicates the presence of a monomeric surface species (S2-). Sp ectral deconvolution of the surface sensitive spectrum indicates another co ntribution near 162 eV, the origin of which is uncertain. It may represent S atoms in sixfold coordination, surface dimers (S-2(2-)) or both.