A Comparative Study of Electron Energy-Loss Spectroscopy (EELS) and X-ray Absorption Near Edge Structure (XANES) Spectroscopy for Probing the Oxidation State of Transition Metals in Planetary Materials
نویسندگان
چکیده
Planetary materials contain an abundance of 3d transition metals. They occur in mineral phases that formed in a wide range of environments, e.g., the gaseous envelopes surrounding ancient stars and the early solar nebula. The ability of such metals to occur in multiple oxidation states makes them potentially useful recorders of the redox conditions under which their host assemblage formed or last equilibrated. Thus, measurements of the oxidation state of 3d metals in planetary materials can serve as a probe of redox conditions in ancient nebular or stellar environments. Such measurements are important for characterizing returned samples from current and future missions, e.g., Stardust [1] and OSIRIS-Rex.
منابع مشابه
Rapid Mapping of Lithiation Dynamics in Transition Metal Oxide Particles with Operando X-ray Absorption Spectroscopy
Since the commercialization of lithium ion batteries (LIBs), layered transition metal oxides (LiMO2, where M = Co, Mn, Ni, or mixtures thereof) have been materials of choice for LIB cathodes. During cycling, the transition metals change their oxidation states, an effect that can be tracked by detecting energy shifts in the X-ray absorption near edge structure (XANES) spectrum. X-ray absorption ...
متن کاملOxidation State of Vanadium in Glass and Olivine from Terrestrial and Martian Basalts: Implications for Oxygen Fugacity
INTRODUCTION Several studies have demonstrated the usefulness of Synchrotron micro x-ray absorption near edge structure (XANES), or (SmX) spectroscopy, to determine the oxidation state of elements in planetary materials. Delaney et al. [1] used SmX to investigate the oxidation states Fe, Cr, and V in extraterrestrial samples, and later determined the oxidation state of V in experimental glasses...
متن کاملCore-hole effects on energy-loss near-edge structure.
We present first-principles electron energy-loss near-edge structure calculations that incorporate electron-hole interactions and are in excellent agreement with experimental data obtained with X-ray absorption spectroscopy (XAS) and electron energy-loss spectroscopy (EELS). The superior energy resolution in XAS spectra and the new calculations make a compelling case that core-hole effects domi...
متن کاملProbing the Local Chemical and Structural Ordering of Iron Oxyfluoride
Scanning transmission electron microscopy (STEM)-electron energy loss spectroscopy (EELS) has been used for studying local structure of the energy related materials. High resolution (Cs-corrected) STEM is regarded as a promising technique to observe morphological evolution and atomic arrangement inside single particles. Combining with EELS technique, one could probe the local chemical structure...
متن کاملA Review of the Applications of Synchrotron Radiation in Archaeological Sciences
The scientific research regarding investigation, characterization and protection of the archeological specimens is manifested through a notable participation of multidisciplinary subjects and experts, scientists and archeometrists. One of the main principals which are considered by archaeometrists in the study of the precious specimens is the utilizing nondestructive methods. As an example, in ...
متن کامل