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Publication
Molybdenite as a rhenium carrier : first results of a spectroscopic approach using synchrotron radiation
Advisor(s)
Abstract(s)
The chemical and physical properties of rhenium render it a highly demanded metal for advanced applications in important industrial fields. This very scarce
element occurs mainly in ores of porphyry copper-molybdenum deposits associated with the mineral molybdenite, MoS2, but it has also been found in granite
pegmatites and quartz veins as well as in volcanic gases. Molybdenite is a typical polytype mineral which crystal structure is based on the stacking of [S-Mo-S]
with molybdenum in prismatic coordination by sulphide anions; however, it is not yet clearly established if rhenium ions replace Mo4+ cations in a disordered
way or else, if such replacement gives rise to dispersed nanodomains of a rhenium-rich phase. As a contribution to clarify this question, an X-ray absorption
spectroscopy (XANES) study using synchrotron radiation was performed at the Re L3-edge of rhenium-containing molybdenite samples. Obtained results are
described and discussed supporting the generally accepted structural perspective that rhenium is mainly carried by molybdenite through the isomorphous
replacement of Mo, rather than by the formation of dispersed Re-specific nanophase(s).
Description
Keywords
Molibdenite Rénio Absorção de raios X Espectroscopia de raios X Radiação de sincrotrão XANES
Citation
Silva, Teresa Pereira... [et al.] - Molybdenite as a rhenium carrier : first results of a spectroscopic approach using synchrotron radiation. In: Journal of Minerals and Materials Characterization and Engineering, vol. 1, nº 5 (September 2013), p. 207-211