Topic
Chemical state
About: Chemical state is a research topic. Over the lifetime, 2378 publications have been published within this topic receiving 78183 citations.
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20 Jun 2006
TL;DR: In this paper, the Kβ emission spectrum of chromium was experimentally analyzed in different compounds and compared with previous data using a backdiffracting crystal analyzer with spherical focalization and synchrotron radiation monochromatic excitation.
Abstract: The Kβ emission spectrum of chromium was experimentally analyzed in different compounds and compared with previous data. Measurements of whole Kβ spectra were performed with a wavelength dispersive commercial XRF equipment. To study possible effects of the chemical state in the width and position of the main Kβ1,3 line, high resolution measurements were also performed. In the latter measurements, a spectrometer based on a backdiffracting crystal analyzer with spherical focalization and synchrotron radiation monochromatic excitation was used. Kβ1,3 line shifts in relation to metallic Cr were observed, both to higher energies (≅+1 eV) for CrIII and to lower energies (≅−0.5 eV) for CrVI. It was also found that the natural width of CrKβ1,3 line, the ionization energy of the 3p orbital of Cr, and the relative intensities of Kβ″ and Kβ2,5 lines with respect to the main Kβ1,3 line increase as the oxidation state increases. The use of these features as an index for chemical state analysis is discussed.
29 citations
TL;DR: In this paper, the modification of platinum electrode surfaces by bismuth and sulfur adatoms was studied using cyclic voltammetry, in situ FTIR spectroscopy and X-ray photoelectron spectroscopic (XPS).
29 citations
TL;DR: In this article, the phase, composition and chemical states of elements at the tungsten surface were studied using X-ray diffraction and photoelectron spectroscopy (XPS).
29 citations
TL;DR: In this article, three Pd/CeO2 catalysts were respectively prepared by reduction-deposition and impregnation method (IMP) to investigate the effect of chemical state of Pd on CO oxidation.
29 citations
TL;DR: In this paper, X-ray photoelectron spectroscopy was used to examine the composition and chemical state of anodically-formed corrosion layers on FeNiCrPB amorphous alloys in a 1/2 M Na2SO4 solution with pH 5.
Abstract: X‐ray photoelectron spectroscopy was used to examine the composition and chemical state of anodically‐formed corrosion layers on FeNiCrPB amorphous alloys in a 1/2 M Na2SO4 solution with pH 5. Amorphous alloys are highly resistant to corrosion and particular attention was given to the chemical states of Cr and P, the elements known to play a major role in the corrosion resistance. A careful sample transfer procedure was established to minimize changes in the sample during transfer from solution to vacuum. A systematic and reproducible progression of chemical states was observed that was related to structure in the polarization curve and to elemental stability diagrams. The largest change in the P 2p oxidation state occurred between 0 and 700 mVSCE while the Cr2p3/2 oxidation state changed between 700 and 1150 mVSCE. Surface concentrations of P and Fe increased with increasing anodic potential, while concentrations of Ni, Cr, and B decreased.
29 citations