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XANES
About: XANES is a research topic. Over the lifetime, 7737 publications have been published within this topic receiving 188032 citations.
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TL;DR: X-ray absorption near-edge structure (XANES) spectroscopy using synchrotron radiation is a well-established technique providing information on the electronic, structural and magnetic properties of matter as discussed by the authors.
Abstract: The previous Reviews in Mineralogy volume on spectroscopic methods (Vol. 18 Spectroscopic Methods in Mineralogy and Geology , Frank C. Hawthorne, ed. 1988), contained a single chapter on X-ray absorption spectroscopy which reviewed aspects of both EXAFS (Extended X-ray Absorption Fine Structure) and XANES (X-ray Absorption Near-Edge Structure) (Brown et al. 1988, Chapter 11) However, since publication of that review there have been considerable advances in our understanding of XANES theory and applications. Hence EXAFS and XANES have been separated into their own individual chapters in the current volume. In this chapter we endeavor to bring the reader up to date with regard to current XANES theories, as well as, introducing them to the common applications of the technique in mineralogy, geochemistry and materials science. There have been several reviews of XANES (cf., Brown et al. 1988, Brown and Parks 1989, Manceau et al. 2002, Brown and Sturchio 2002, Mottana 2004, Rehr and Ankudinov 2005, de Groot 2001, 2005, and papers therein). In this chapter on XANES it is not our intention to provide a comprehensive review of all the XANES studies since 1988 but to summarize what X-ray edges are commonly investigated and what one can expect to be able to extract from the data. The reader is also advised to read the chapters in this volume on analytical transmission electron microscopy by Brydson et al. (2014, this volume) where (core level) electron energy loss (EELS) spectroscopy is discussed, and by Lee et al. (2014, this volume) on X-ray Raman spectroscopy (XRS), as these techniques provide element specific information similar to XANES.
X-ray absorption near-edge structure (XANES) spectroscopy using synchrotron radiation is a well-established technique providing information on the electronic, structural and magnetic properties of matter. In XANES, …
221 citations
TL;DR: A comprehensive structural/architectural evaluation of the PtRu (1:1) alloy and Ru@Pt core-shell nanoparticles (NPs) provides spatially resolved structural information on sub-5 nm NPs, showing that the Ru and Pt metals remain phase-separated in the core and shell components and that the interface between thecore and shell is quite normal.
Abstract: A comprehensive structural/architectural evaluation of the PtRu (1:1) alloy and Ru@Pt core−shell nanoparticles (NPs) provides spatially resolved structural information on sub-5 nm NPs. A combination of extended X-ray absorption fine structure (EXAFS), X-ray absorption near edge structure (XANES), pair distribution function (PDF) analyses, Debye function simulations of X-ray diffraction (XRD), and field emission transmission electron microscopy/energy dispersive spectroscopy (FE-TEM/EDS) analyses provides complementary information used to construct a detailed picture of the core/shell and alloy nanostructures. The 4.4 nm PtRu (1:1) alloys are crystalline homogeneous random alloys with little twinning in a typical face-centered cubic (fcc) cell. The Pt atoms are predominantly metallic, whereas the Ru atoms are partially oxidized and are presumably located on the NP surface. The 4.0 nm Ru@Pt NPs have highly distorted hcp Ru cores that are primarily in the metallic state but show little order beyond 8 A. In c...
219 citations
TL;DR: The theoretical calculation indicated that the most significant feature in the electronic band structure of the metal-doped La2Ti2O7 was the formation of a partially filled 3d band in the band gap of La2 Ti 2O7, while the contribution of these dopants on the valence band was negligible.
Abstract: In the search for efficient photocatalysts working under visible light, we have investigated the effect of cation substitution on a layered perovskite, La2Ti2O7. Among various metal dopants, only Cr and Fe induced intense absorption of visible light (λ > 400 nm), and only these catalysts produced H2 photocatalytically from water in the presence of methanol under visible light irradiation (λ > 420 nm). The polymerized complex method was found to be more efficient for fabrication of the present catalysts producing a more homogeneous structure than the solid-state reaction. The characterization by XRD, UV−vis DRS, XPS, and XANES revealed that doped Cr and Fe were present in the Cr3+ and Fe3+ states substituting for Ti sites in the La2Ti2O7 lattice. The theoretical calculation indicated that the most significant feature in the electronic band structure of the metal-doped La2Ti2O7 was the formation of a partially filled 3d band in the band gap of La2Ti2O7, while the contribution of these dopants on the valence...
219 citations
TL;DR: A unique spectroscopic feature has been identified in a study of twenty-five different samples of meteoritic insoluble organic matter (IOM) spanning multiple chemical classes, groups, and petrologic types, using carbon X-ray Absorption Near Edge Structure (XANES) spectroscopy as discussed by the authors.
218 citations
TL;DR: In this paper, both indirect (FTIR) and direct (X-ray Absorption Near Edge Structure (XANES) spectroscopic techniques were applied to investigate the adsorption.
Abstract: Arsenic toxicity, mobility, and bioavailability in soil-water systems are highly dependent on its oxidation states and chemical species. In this study, both indirect (FTIR) and direct (X-ray Absorption Near Edge Structure (XANES) spectroscopic techniques were applied to investigate the adsorption
217 citations