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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TL;DR: In this article, it was shown that the oxidation rate of manufactured graphites increases with increased distance from the surface, and the preponderance of the data supports the conclusion that this phenomenon is due to increased catalytic activity of one or more of the impurities in the graphite.
7 citations
TL;DR: LuGdVO3 was obtained by annealing the LuGdVVO4 crystal at 1500°C under vacuum condition as mentioned in this paper, and the X-ray fluorescence analysis method was used to measure the concentrations of Lu and Gd elements in the crystal.
Abstract: LuGdVO3 was obtained by annealing the LuGdVO4 crystal at 1500 °C under vacuum condition. The X-ray fluorescence analysis method was used to measure the concentrations of Lu and Gd elements in LuGdVO4. The XRD result indicated that LuGdVO3 was the orthorhombic structure with space group Pbnm. The Raman spectrum of LuGdVO3 was investigated at room temperature. The chemical states and local symmetry of the LuGdVO3 crystal have been determined by XPS and XANES. It was found that the presence of different chemical forms of V evolved with annealing treatment, and the VO6 unit in the LuGdVO3 crystal was distorted octahedron. During the annealing process at high temperature under vacuum condition LuGdVO4 can be gradually translated to LuGdVO3 with decreasing lattice oxygen in the crystal lattice.
7 citations
TL;DR: In situ ambient-pressure X-ray photoelectron spectroscopy combined with resistivity measurement was performed for a Pt thin-film H2 gas sensor to experimentally demonstrate that the chemical state of the Pt surface changes under working conditions, and it directly links to the sensing performance.
7 citations
TL;DR: In this article, the chemical state sensitive imaging of Ag/Si (111) using Ag 3D core photoelectrons was tried using a spectroscopic photo emission and low energy electron microscopy at SPring-8.
Abstract: The chemical state sensitive imaging of Ag/Si (111) using Ag 3d core photoelectrons was tried using a spectroscopic photo emission and low energy electron microscopy at SPring-8. XPS spectrum obtained from the two-dimensional (2D) Ag/Si(111) √3 × √3 structure exhibits the chemical shift of about 0.5 eV toward the higher binding energy with respect to that from the three-dimensional (3D) Ag(111) island with 1 × 1 structure. The direct imaging of the difference in the chemical bonding state between the 3D and 2D structure has been tried, but it was not easy because the XPS signal from the 3D island was fairly larger than that from the 2D layer. The XPEEM images relative to a reference image taken in between XPS peaks of the 3D and 2D structures made the visualization of the different chemical state possible. Copyright © 2008 John Wiley & Sons, Ltd.
7 citations
TL;DR: In this paper, the surface with a (1 × 1) structure and with multi-layers of sulfur were reconstructed to a ( 1 × 2) structure by annealing at about 450 and 600°C, respectively.
7 citations