Fe-Mössbauer Spectroscopic Studies of Fe containing Materials
EMSL Project ID
50688
Abstract
Fe compounds play a critical role in soil organic matter transformation, in removal of metal contaminates from soils, in redox chemistry of catalysts, etc. Identification of the Fe species by commonly used spectroscopic methods, however, is not trivial. For example, in Fe-poor and multi Fe-mineral soil samples, characterization of the type of Fe-oxide nor determining Fe(II)/Fe(III) ratio of clay minerals is not straightforward by X-ray diffraction. In zeolites, it’s not possible to unambiguously determine the symmetry nor immediate coordination of Fe by X-ray absorption methods. Paramagnetic Fe species, such as high spin Fe(III), are not amicable to nuclear magnetic resonance spectroscopy. The 57Fe-specific, 57Fe-Mössbauer spectroscopy (MS) in transmission mode, on the other hand, is preferred complimentary technique to study bulk Fe speciation, regardless of its crystallinity. Coupling MS with other spectroscopic and microscopic techniques, in general, will provide greater insights into the role of Fe in various reactions. In this proposal, we would like to utilize low temperature Mössbauer spectroscopy unit (CCR3) to characterize Fe-containing samples generated by various DOE funded programs, for example, BES geosciences and EM sciences.
Project Details
Start Date
2018-12-18
End Date
2021-09-30
Status
Closed
Released Data Link
Team
Principal Investigator