Topic
Extended X-ray absorption fine structure
About: Extended X-ray absorption fine structure is a research topic. Over the lifetime, 10452 publications have been published within this topic receiving 276744 citations.
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TL;DR: In this article, three titanium silicalite samples with MEL structure and different Ti loadings have been examined by Near-Edge and Extended X-ray Absorption Fine Structure techniques.
97 citations
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TL;DR: In this article, the color change was found to be reversible under moderate heat treatment or after storage in oxidizing atmosphere and is attributed to the reduced W5+ ions, located at the surface of freshly ground powder.
Abstract: Pure ground tungsten trioxide WO3 and (1−x)WO3−y⋅xReO2 mixtures were studied by x-ray absorption spectroscopy, x-ray powder diffraction and Raman spectroscopy in comparison with hydrogen bronzes HxWO3 and hydrogenated calcium tungstate CaWO4:H. It was found that a grinding of pure WO3 leads to a decrease of the crystallites size and a development of the bluish coloration. The color change was found to be reversible under moderate heat treatment or after storage in oxidizing atmosphere and is attributed to the reduced W5+ ions, located at the surface of freshly ground powder. The (1−x)WO3−y⋅xReO2 mixtures were found to be composed of monoclinic/orthorhombic WO3 and orthorhombic ReO2 phases with a grain boundary containing reduced W5.7+ ions which are mainly responsible for the compound color at low rhenium ion concentrations. In both cases, the W(6−z)+ (0
96 citations
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TL;DR: In this paper, the optical absorption spectra of bimetallic nanoparticles were recorded and compared with various ratios of Ag/Au alloy nanoparticles, which suggested the formation of core-shell structure.
96 citations
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TL;DR: In this paper, the sensitivity of x-ray absorption spectroscopy to cubic-hexagonal polytypism in which nearest-neighbor positions are virtually unchanged was investigated.
Abstract: We investigate the sensitivity of x-ray absorption spectroscopy to cubic-hexagonal polytypism in which nearest-neighbor positions are virtually unchanged. Experimental spectra and multiple-scattering calculations are reported at the major absorption edges in the zinc-blende and wurtzite modifications of ZnS. We demonstrate that d-like unoccupied bands are preferentially affected, as only L-edge absorption is sensitive to this structural transition. The results allow near-edge x-ray absorption spectroscopy to be evaluated as a detection method for crystal structure modifications in nano-scale systems.
96 citations
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TL;DR: In this article, the authors characterized chromate adsorbed on the surface of hematite was characterized by density functional theory, Cr K-edge extended X-ray absorption fine structure (EXAFS) measurements, and in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy.
96 citations